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Chapter 2
CONSTRUCTION SUPPLY CHAIN
2.1 Introduction
Construction is one of the most complex and information dependent industries.
Construction projects involve a large number of people in different disciplines working on
instructions passed on by others. Therefore, controlling and managing a construction
project effectively and efficiently are extremely difficult owing to the high fragmentation
and involvement of numerous participants. In recent years, the application of supply chain
management (SCM) philosophy has been widely investigated as an effective and efficient
measure to improving the performance of the construction industry. SCM is a concept that
originates from the automotive manufacturing industry (Toyota Manufacturing Plant). The
implementation of SCM technique in manufacturing environments has resulted in an
increased value of production while improving customer service. The distribution industry
has also been successful in adopting SCM in their operations. Following the example of
these sectors of the economy, a small but increasing number of construction organisations
are now beginning to adopt SCM in the hope of achieving similar benefits. This is further
encouraged by the rapid developments in the information and communication technologies
(ICT), which means that timely and accurate information will be available to support an
organisation’s services to achieve its client’s objectives of high value-added product.
This chapter reviews the concept of construction supply chain management, management
problems and barriers that have been studied by numerous known researchers and
construction industry experts. Established procurement methods are also briefly discussed
in order to determine the communication path in the supply chain management network.
The review also highlights the limitations and barriers of ICT implementation in the
construction supply chain management.
Context-Aware Services Delivery in the Construction Supply Chain
14
2.2 Overview of the UK Construction Industry
The construction industry has fundamentally been characterised as high fragmented, low
productivity, full of conflicts and disputes and poor in managing cost and time (Whicker et
al., 2006; Xue et al., 2007). However, in the UK there is a growing awareness of the need
for changes within this industry, in particular with managing its current business processes.
This is mainly as a result of three previous government sponsored reports in the UK
Construction, i.e. Latham (1994), Egan (1998) and Strategic Forum for Construction
(2000) which have drawn attention to the problems of the industry’s supply chain, calling
for greater integration of key processes to ensure that better value can be delivered to the
clients. In an effort to address this issue, several construction organisations have started to
emulate the most appropriate supply chain model from other industries to be successful in
managing their businesses. However, according to Flanagan (2002), the construction sector
has not been good at applying technologies from other industries and consequently
duplication of effort occurs.
The construction industry has a major influence on the UK economy through the
construction of facilities such as offices, schools, hospitals, factories and road
infrastructure. Globally, the UK construction industry plays an important role in economic
development and has the capability of delivering the most difficult and innovative projects
in the world. As one of the pillars in the domestic economy in the UK which produced an
output of around £58 billion in 1998, i.e. equivalent to 10% of Gross Domestic Product,
the report of the Construction Task Force (Egan, 1998) made to the UK government had
stressed various important key drivers to modernise the construction sector. Hence, the
awareness of the need for changes in managing their supply chain networks within this
industry in the UK has increased.
A report for the New Construction Innovation and Strategy Panel (nCRISP) produced by
Rigby et al. (2005) had stressed that the diffusion of ICT into the construction industry is
likely to drive improvements in the productivity of the industry and also provide
opportunities to improve the supply chain and logistics operations. This is because the
current ICT enables the integration of various engineering and communication software
which cannot previously be done.
Context-Aware Services Delivery in the Construction Supply Chain
15
2.3 Generic Supply Chain Management Definition
The aim of supply chain management is to coordinate planning and control of each process
to meet the needs of the end customer. The concept of supply chain management has been
practiced for many years in the manufacturing sector that originates from an innovative
philosophy by Toyota production plant. Previously known as Just-in-time (JIT), it then
merged with the concept of Total Quality Management (TQM) and Quality Control (QC)
to form the concept of supply chain (Vrijhoef and Koskela, 2000). Referring to Harrison
and White (2006), the analogy of ‘flow of water in a river’ is often used to describe
organisations near the source as upstream and those near the end customer as downstream.
The analogy shows how important it is for each member in a supply chain to interact with
each other like water molecules in order to collectively transform materials into finished
product. According to Harrison and White (2006), the definitions of supply chain and
supply chain management can be described respectively as follows:
“A supply chain is a group of partners who collectively convert a basic commodity
(upstream) into a finished product (downstream) that is valued by end customers,
and who manage returns at each stage.”
“Planning and controlling all of the processes that link partners in a supply chain
together in order to serve needs of the end customer.”
From both definitions and Fig. 2-1, the supply chain can be seen as a network that consists
of a group of people and processes that extend across organisational boundaries where
each member in a supply chain group is responsible for transforming the inputs (materials)
and information into outputs (value-added product). Specifically, supply chain
management involves two important operations, namely: planning and controlling. The
process of planning can be referred to as an operation to make a plan that defines how
much raw materials should be bought, made, distributed and sold. Meanwhile, the process
of controlling is an operation that keeps the process as planned. This can be seen in
aerospace industry where the concept of supply chain management is well-established due
to the strict business needs, i.e. requires highly-skilled workers, high-tolerance products,
time constraint and well-established strategic partnership with government (known also as
political driven business group).
Context-Aware Services Delivery in the Construction Supply Chain
16
2.4 Construction Supply Chain Definition
To be specific towards the construction industry supply chain operations, Xue et al. (2007)
had given the meaning for both Construction Supply Chain (CSC) and Construction
Supply Chain Management (CSCM) as follows:
“CSC consists of all the construction business processes, from the demands by the
client, conceptual, design and construction to maintenance, replacement and
eventual decommission of building, and organisations which are involved in the
construction process, such as client/owner, designer, general contractor,
subcontractor, supplier and consultant.”
“CSCM is the integration of key construction business processes, from the demands
of client, design to construction and key members of construction supply chain
including client/owner, designer, contractor, subcontractor and supplier.”
Referring to Fig. 2-2, it can be said that CSC is a network of multiple organisations that
involves a system of activities that links people, consists of operations of information,
building components services and funds between client, consultant team, main contractor,
subcontractors and suppliers (Azambuja and O'Brien, 2009; Formoso and Isatto, 2009).
Meanwhile, the concept of CSCM addresses business processes that involve the managing
Suppliers Manufacturers Assemblers
Retailers Customers
Sales Use or
Consumption
Products
Assembly
Parts
Manufacture
Materials
Material flow (supplies, production, deliveries, schedules, forecast)
Information flow (orders, schedules, forecast)
Upstream Downstream
Fig. 2-1: The Generic Configuration of Supply Chain in Manufacturing
(reproduced from Vrijhoef and Koskela (1999))
Context-Aware Services Delivery in the Construction Supply Chain
17
of both planning and controlling of human resources and utilise suppliers’ resources,
infrastructures and services in order to serve the client’s demand.
2.5 Characteristics and Roles of Construction Supply Chains
Management
Traditionally, a construction team is a temporary organisation that has been formed to run
a specific project within a specific time period. This formation consists of different groups
of companies and practices background which may not have a previous strategic
partnership and are tied to the project team by means of varying contractual arrangements
(Xue et al., 2007). The contractual arrangements depend on the procurement route or
method of a particular project. Procurement methods are discussed further in section 2.9.
In terms of structure and function, the CSC can be characterised as follows (Vrijhoef and
Koskela, 1999):
Fig. 2-2: Construction Supply Chain (adapted from Vaidyanathan (2009))
Subcontractor 3
Subcontractor 1 Subcontractor 2
Structural
Consultant
M&E
Consultant
Architect General (Main)
Contractor
Customer
Component
Manufacturer 1
Component
Manufacturer 2
Component
Manufacturer 3
Flow of building components
Flow of funds
Information flow
Context-Aware Services Delivery in the Construction Supply Chain
18
All materials and services are focused to the point of use, i.e. construction site
where the object is building from incoming sources.
One-off project involving multiple background sectors in the supply chain which
focus on short-term businesses, resulting in instability and fragmentation in the
industry.
The business concept is based on make-to-order with every project creating a new
product.
Meanwhile, the impact CSCM has an on management depends on the role it plays; whether
it focuses on the supply chain, the construction site or both. There are four main roles that
had been established by Vrijhoef and Koskela (2000) and they are as follows:
Focus on the impacts of the supply chain on site activities. The goal is to reduce
costs and duration of site activities.
Focus on the supply chain itself, with the goal of reducing costs, especially those
relating to logistics, lead-time and inventory.
Focus on transferring activities from the site to earlier stages of the supply chain.
The goal is to avoid the basic inferior conditions on site which is not possible with
site construction with its many technical dependencies.
Focus on the integrated management and improvement of the supply chain and the
site production.
2.6 Supply Chain Management in Construction
A construction project supply chain network can be a complex web of systems, sub-
systems, operations or activities and their relationships to one another. These belong to
various members of the supply chain namely: suppliers, carriers, manufacturing plants,
distribution centres, retailers and consumers. The design, modelling and implementation of
such a system, therefore, can be difficult unless some parts of it are cohesively integrated.
In connection to this, the concept of supply chain management is about managing
coordinated information and material flows, plant operations and logistics through a
common set of principles, strategies, policies and performance metrics throughout its
developmental life cycle (Lee et al., 1993). In CSC, coordination is achieved within
Context-Aware Services Delivery in the Construction Supply Chain
19
temporary organisations formed of firms or stakeholders to provide specific productive
capacity for a given project to satisfy client’s demands.
2.6.1 Common Problems
The construction and its supply chain integration is always quoted as fragile by numerous
researchers due to failure to understand the methodologies of design, material/component
selections, processes and procurement routes adopted (Briscoe and Dainty, 2005). Vrijhoef
et al. (2001) had revealed that the major problems in construction supply chain originate at
the interfaces of stages in the network as shown in Fig. 2-3. This is agreed by Ballal (1999)
who recommended that past construction knowledge and expertise to be extracted and used
in early design decisions for better integration of design and construction stages. In
addition to that, Green et al. (2005) also found that the decades long of work culture is the
hardest barrier to overcome. The reluctance to change is made worse by poor
understanding of the relationship between time and cost that eventually results in delay,
increased costs, defects and contractual conflict of the construction project (Whicker et al.,
2006).
Fawcett et al. (2008) had revealed that failure in recognising the importance of technology
and the role of information is a major barrier towards successful supply chain
collaboration. Most construction organisations are technologically conservative
organisations. They are unwilling to invest in new, costly and unproven technology due to
the lack of belief of its potential benefits. The lack of awareness among top management
and lack of client enforcement are among the reasons why construction organisations do
not adopt the SCM model for their businesses. Xue et al. (2007) and Kim et al. (2008) had
revealed that high fragmentation and poor coordination added with inefficient
communications, inaccurate information transfer and wrong deliveries within the supply
chain networks eventually degrade the overall performance of construction organisations.
The information intensive nature of construction projects requires the parties involved to
have on-demand access to construction information such as project plans, logistics,
schedules, budgets and workforces. The rapid development in ICT coupled with the
advancement in wireless technologies offers a solution for construction organisations to
address the aforementioned issues. Consequently, ICT is one of the drivers for construction
organisations to address the key factors for radical change to achieve long-term benefits.
Context-Aware Services Delivery in the Construction Supply Chain
20
Fig. 2-3: Generic problems in the construction process (Vrijhoef et al., 2001)
2.7 Information and Communication Technologies in Construction
The amount of project data and information generated during design/construction periods
are enormous and uncontrolled due to the fragmented nature of the construction industry.
Despite the fast development in ICT emerging as a driving force for construction
companies to be more efficient and productive (Ribeiro and Lopes, 2001; Ahuja and Yang,
2005), the traditional communication and information method is still being practiced. This
is mainly due to a number of factors such as high investment in ICT infrastructure capital
cost and insufficient supporting interoperability between hardware–software within
construction organisations. However, the issue of interconnectivity is being actively
explored to overcome critical unresolved problems. The emergence of interconnectivity
between different communication networks over the internet are encouraging many
construction organisations to seek an alternative method of processing and transferring
data (Aziz et al., 2005; Aziz et al., 2006; Lu et al., 2006; Zhou and Benton Jr., 2007; Leung
et al., 2008). The use of Information Technology (IT) and learning from other industries
were part of the action plans recommendation by the Strategic Forum committee (2000) for
better construction logistics services. Jang et al. (2003) and Rebolj et al. (2008) also
suggested that an information delivery system and services must focus on improving the
construction logistics in order to achieve better productivity, avoiding delays and reducing
waste in a construction project.
Context-Aware Services Delivery in the Construction Supply Chain
21
The internet is bringing a major contribution to the evolving field of supply chain
management and this can be seen through the introduction of e-commerce which is able to
reduce ‘clerical’ transaction costs such as those involving contracting, ordering,
confirming, invoicing and settlement. Information moved via the internet has a number of
characteristics that can change the way in which construction supply chains are configured
and managed. However, it is a great challenge to identify which ICT package is capable of
solving such issues in order to deliver various jobs or tasks within the context (Egan, 1998).
In addition, Aziz et al. (2006) had revealed that the current state-of-the-art in mobile
communications in the construction industry has some underlined limitations due to factors
such as lack of cohesion with existing ICT infrastructure and little attention given towards
developing automation in the construction industry. Consequently, it is another great
challenge to implement powerful wireless and web technologies to support and improve
the construction information and communication flow in supporting project team to access
in real-time different corporate back-end systems and multiple inter-enterprise data
resources collaboration and integration. Fortunately, the growth in number and
sophistication of web services means that, increasingly, useful applications will be
available on the internet that can be invoked directly from the construction supply chain
management systems. These invocations can be triggered by changes in the context of the
users or the project and can significantly enhance the effectiveness of construction supply
chain interactions. This provides enhanced capabilities for interoperation between a variety
of services and applications that are essential for intelligent collaboration and information
exchange within the supply chain management network. Intelligent Wireless Web (IWW)
as shown in Fig. 2-4 represents the next generation of ICT application to construction
supply chain management. This intelligent system uses artificial agents and has the
potential of serving and improving the construction supply chain through access to context-
specific data, information and services. Due to the nature of construction activities, agent-
based systems could offer some additional benefits in enhancing the supply chain
management (Cutting-Decelle et al., 2007):
System Flexibility – A supply chain is a domain which is frequently subjected to
structural changes. This gives a robust system that can undergo continuous
adoption to the changes in the environment without the degradation of performance
often met in other types of systems. Automated procedures can be developed to
Context-Aware Services Delivery in the Construction Supply Chain
22
deal with the adding and removing of agents to the system and changes within an
agent will not affect other agents.
Integration and Coordination – A multi-agent system facilitates both multi-plant
and general coordination. An example would be when an agent is planning
production. The agent may be planning for one site in a supply chain, but
information can be passed to and received from other sites, allowing a coordinated
production planning.
Responsive and Speed – A multi-agent system would also allow a high degree of
reactivity to unforeseen events. The occurrence of an unexpected event, e.g. an
order cancellation, can be communicated to every concerned entity in a matter of a
few minutes. One important consequence of this is that customers could be
informed of changes in delivery times caused by unexpected events.
Referring to Aziz et al. (2004) and Anumba and Aziz (2006), IWW architecture system
includes Semantic Web (to provide a framework for shared definitions of terms, resources
Fig. 2-4: Intelligent Agent Roles in IWW System Deployment in Construction Supply
Chain Delivery Services (Aziz et al., 2004; Anumba and Aziz, 2006)
Context-Aware Services Delivery in the Construction Supply Chain
23
and relationships), Web Services (to provide dynamic discovery and integration) and
multi-agent technologies (to help mobile worker accomplish a particular task such as
purchasing parts from suppliers) to support intelligent mobile collaboration. In conjunction
to this, context-aware application is seen as an additional layer on top of IWW which could
provide the ability to intelligently interpret the user context and deliver data and services to
a project team member based on the user’s context. The context-aware technology
application is reviewed in Chapter 3.
2.7.1 Information Delivery Issue in Construction Supply Chain
The information intensive nature of construction projects requires that the parties involved
have on-demand access to construction information such as project plans, schedules,
budgets, workforces and logistics. The construction supply chain is complex and difficult
to manage because it involves operations or activities of multi-disciplined groups. The
operations and activities involved in construction projects are temporary and organisations
are formed to work together to manage and build a specific project (Vrijhoef and Koskela,
2000). According to Xue et al. (2007), CSC is not only a business to business (B2B) chain
relationship but it is also a network of multiple organisations that are related to activities
that involve the flow of information, flow of materials, services or products and the flow of
funds between client, designer, contractor and supplier. In reality, information flow is
usually not as smooth as planned due to uncertainty existing between the supply source and
subcontractors caused by lack of information sharing and sometimes due to wrong
information delivered to the supply chain members. Harrison and White (2006) had
stressed on the importance of each member in a supply chain to interact with each other in
order to be collectively responsible for transforming materials and information into value-
added products and services.
2.8 Construction Supply Chain Services Model Framework
A vital understanding of the supply chain components and activities to be mapped-out in
an operation is critical because services performance or value-added is measured at every
stage along the supply chain. According to Azambuja and O’Brien (2009), reviews on
other researchers’ supply chain model indicate that to-date there are no clear model
capable of supporting the overall operations of the different construction procurement
Context-Aware Services Delivery in the Construction Supply Chain
24
routes effectively. Existing models such as Value Stream Mapping (VSM) lack support in
wide-scale analysis of operational decisions for specific supply chain process. For a more
strategic and operational decision to be made effectively along the construction supply
chain, Azambuja and O’Brien, (2009) had presented a conceptual framework to model a
construction supply chain activities and services from start to the finished product. Five
sequential steps have been established for the model development as follows:
Step 1 - Define supply chain model purpose
Step 2 - Establish supply chain performance measures
Step 3 - Determine product type
Step 4 - Define supply chain configuration
Step 5 - Characterise supply chain elements (e.g. companies, processes and flows)
There are eight goals being listed in Step 1 based on their previous experiences in the
construction and manufacturing supply chain operations. Among the goals are as follows:
Evaluate production decisions
Evaluate transport decisions
Illustrate the supply chain information coordination (IT application).
After defining the goals, the next step (Step 2) is to set the performance measure associated
with each goal. For example, if the goal is to reduce the on-site inventory buffer, the
manager needs to focus on the number of items in stock, average waiting time in stock and
installation demand rate. Step 3 is to determine what product or component type is to be
modelled for. There are four product types which can be associated with different kinds of
manufacturing technique, the supply chain boundaries (environment and actors) and supply
chain processes (activities). The four identified product types are as follows:
Made-to-stock (MTS)
Assembled-to-order (ATO)
Made-to-order (MTO)
Engineered-to-order (ETO)
Context-Aware Services Delivery in the Construction Supply Chain
25
Steps 4 and 5 are associated with the identifying of construction supply chain boundaries
(i.e. the supplier, warehouse, logistician, subcontractor or main contractor and on-site job.)
and the supply chain processes. For example, if an MTS product is chosen, the operation
will involve three main boundaries. Once the subcontractor or main contractor has placed
an order, the next operation will take place by the nominated MTS supplier and once the
product is available, the next operation is to deliver to the warehouse before arranging for
delivery to site. The supply chains for production operations are shown in Fig. 2-5.
2.8.1 E-Business Services for Construction Supply Chain
Web services technology is a cost effective tool in the integration of construction supply
chain services because it minimises administration waste. The business methods of
internet and web services technology such as e-procurement and e-collaboration are among
the services that facilitate the coordination of various decisions and activities along the
construction supply chains (Ribeiro and Lopes, 2001). The e-procurement service model
which is the heart of the construction supply chain automation developed by Alarcon et al.
(2009) is the best to be referred to. They developed a model for a centralised type of
operation with the intention of minimising the cost of searching for the best price, to
reduce last-minute purchases and to decrease inventory level. Their model shown in Fig.
2-6 describes the sequence of e-procurement services ranging from on-site, followed by
on-site (purchasing) main office, supplier office and finally back to on-site to complete the
services.
Context-Aware Services Delivery in the Construction Supply Chain
26
Manufacture MTS
Product
Deliver MTS
Product
Receive
Order
Deliver MTS Product
No
Finished Good
Available?
Raw
Material
MTS Supplier n
Pick and Load
Product
Deliver
Product Unload
Product
Finished
Good
Store
Product
Warehouse n
Inspect
Product Install Unload
Product
Store
Product
On-site (Job Site)
Yes
A
B
C
B
C
Fig. 2-5: Construction supply chain configuration in MTS (Made-to-stock) type
operations (reproduced from Azambuja and O’Brien (2009))
Context-Aware Services Delivery in the Construction Supply Chain
27
Fig. 2-6: The e-procurement services model in construction supply chain (reproduced from
Alarcon et al. (2009))
Deliver request
Planned
purchase
Approve request
Approve request
Get quotes for
materials
Follow-up materials delivery
Receive PO
Receive PO
Produce the purchase order
(PO) Approve PO
Approve/Select
supplier
Detect need for
materials Place request
No Request approval
from Project
Manager
Check request Request
OK Submit request
Yes
No purchase
No
Yes
Reception process
On-site
Purchasing office
Supplier office
On-site
Context-Aware Services Delivery in the Construction Supply Chain
28
2.9 Procurement Methods
Traditionally, the teams working on a construction project come from several different
organisations, with different backgrounds and expertise. Hence, the relationships between
the teams in construction are temporary in nature. They are usually formed and only last
for the duration of the construction project. In an effort to be more efficient, there are
several fairly new construction concepts that can be chosen in place of the traditional
method. To name a few, they are Design and Build, Management Contracting,
Construction Management and the more recent ones include Prime Contracting, Private
Finance Initiative and Partnering.
The choice of construction procurement method is based on a strategic decision made by
the client and/or their advisor (management consultant) by taking into account a
fundamental impact on the demand and the supply chain as a whole. This is strongly
supported by the findings of two case studies conducted by Khalfan and McDermott (2006)
where the innovative procurement has the capacity to improve the management integration
in transferring values throughout the project supply chain’s participants. The decision on
how to procure a construction project lies on a number of identifiable phases: conception,
inception and realisation (London et al., 1998).
The conception phase is to assess the strategic need of the project and typically
includes financial feasibility studies, future growth and market expectations.
The inception phase is to clarify specific project objectives and involves
determining the design brief and the method of procurement, developing a financial
model and producing conceptual designs.
The realisation phase involves resolving the detailed design, construction planning,
tendering and construction.
2.9.1 Traditional Contracting Method (Design-Bid-Build)
The traditional contracting method (Fig. 2-7) requires the owner to manage the planning
phase, hire an architect and then select and hire contractors or a general contractor to
execute the designed works. The three main actors of the project (owner, designer and
contractor) work separately within their scopes of responsibility. The whole process is
Context-Aware Services Delivery in the Construction Supply Chain
29
sequential: the design, then bidding and finally the construction. In the traditional method
of procurement the design supply chain does not understand the underlying costs, hence
suppliers are selected by cost and then squeezed to reduce price and whittle away profit
margins. In general, material procurement processes in pre-construction stage are well
specified and described in order to follow the client and design consultant requirement. A
general or main contractor is a main actor or player to coordinate and focus on the flow of
materials processes. In this organisation, the interaction between the participants or groups
is very limited due to the involvement of dozens of subcontractors, hundreds of suppliers
and possibly thousands of sub-suppliers in a project. Each of these groups has its own
business goal and competes with each other in order to achieve its objectives. Some of the
problems faced by suppliers are as follows:
Bids based on designs to which suppliers have no input
Low bids always won
Unsustainable – costs recovered by other means
Low profit margins
Suppliers distant from final customer, hence limited interest in quality
Fig. 2-7: Traditional contracting method configuration (London et al., 1998)
2.9.2 Design and Build (Turnkey)
In Design and Build or ‘turnkey’ systems as shown in Fig. 2-8, the owner/client employs a
single contractor in order to provide managing, design and construction services. This
single contractor will act as a main/general contractor or hire contractors. There is only one
contractual relationship involving the owner. The contractor takes over the whole
Context-Aware Services Delivery in the Construction Supply Chain
30
responsibility for the completion of the project. The design and construction processes may
be conducted simultaneously (within one team or one company) and therefore improve
information flows and shorten the time of the project delivery. Traditional conflicts
between designers and contractors are eliminated.
Fig. 2-8: Design and Build contracting method configuration (London et al., 1998)
2.9.3 Prime Contracting (PC)
As reported by Holti et al. (2000), the United Kingdom Ministry of Defence had piloted a
strategic procurement method known as Prime Contracting (PC). This strategic mechanism
has potential in promoting a change, value added and innovation to the organisation in a
long run (Soosay et al., 2008). The Prime Contracting procurement method is characterised
by the main contractor having a single point responsibility in designing and building, or
designing, building, operating and maintaining a facility. This shows that the main
contractor is responsible for the whole process with the aims of promoting the concept of
supply chain integration in order to achieve maximum benefits from the project (Holti et
al., 2000). The benefits of the Prime Contracting approach are summarised as follows:
Near zero percentage materials wastage
Reduction of through-life cost from 10% to 14%
Some elements recorded 30% to 113% increment of productivity
The expertise of the supply chain is harnessed and released
Cooperation is the norm throughout the supply chain.
Context-Aware Services Delivery in the Construction Supply Chain
31
2.9.4 Private Finance Initiative (PFI)
PFI is a strategic approach and perfectly applicable for projects with constraint on pumping
out public fund or/and lack of expertise (i.e. technology or managing) within government
agencies in managing the whole project. Projects that usually fall under this category are
toll roads, mass-transit railways and power generation stations. Other projects include
hospitals and prisons. The rationales for the implementation of PFI or concession contracts
are as follows (Smith, 2002):
To minimise the financial impact on the Government.
To introduce and absorb the best managerial and control techniques skill in the
construction by the private sector.
To promote private and entrepreneurial initiatives in infrastructure projects.
To increase the range of financial resources either from local or overseas to fund
such projects.
In PFI procurement route, the contractor (private based firm) finances the project, operates
and maintains it over a sufficient period of time to generate a commercial return. This
strategic approach is also known as concession or build-own-operate-transfer (BOOT)
contract project. The definition of concession project quoted in book edited by Smith (2002)
is as follows:
“A project based on the granting of a concession by a principal, usually a
government, to a promoter, sometimes known as the concessionaire, who is
responsible for the construction, financing, operation and maintenance of a facility
over the period of the concession, before finally transferring, a fully operational
facility. During the concession period the promoter owns and operates the facility
and collects revenues in order to repay the financing and investment costs,
maintain and operate the facility, and make a margin profit.”
The application of PFI in certain mega projects can provide either direct or indirect
benefits to the nation especially for developed countries such as the UK and USA. Some of
the benefits are as follows:
Context-Aware Services Delivery in the Construction Supply Chain
32
Utilisation of foreign companies’ resources such as in transferring new
sophisticated technology.
New foreign capital pump-in into the economy.
Financial advantages for the government financial sheet.
Almost zero burden on the public fund (i.e. tax payers’ money can be saved for
other interests).
Better management and efficient operation that can save the fund and satisfy the
end users.
On the other hand, there are also quite significant problems that should be noted from the
implementation of PFI. They are as follows:
The efficiencies in materialising or deliveries of value by a private sector are still in
doubt due to policy or communication barriers by local authority or government
agencies. This can start even from the process of negotiations and evaluations.
Financing charges are higher for the private sector than for public bodies. This can
increase the concession contract terms and can affect the public expenses.
2.9.5 Partnering
The term ‘partnering’ in the CSCM can be defined as an involvement of two or more
organisations working together to improve performance through mutually agreed common
goals, devising a way for resolving any disputes and committed to continuous
improvement and also sharing gains and pains (Egan, 1998). The concept as shown in Fig.
2-9 has been developed to focus on human touch that emphasises on the process value of
trust, respect and focuses on long-term relationship (Smith, 2002). Akintoye et al. (2000)
found an evidence that the concept being practiced by the UK construction industry results
in an improvement in the production planning and purchasing (i.e. both elements are the
key targets in construction), but the barriers such as lack of commitment from senior
management, lack of appropriate support structures and ignorance of supply chain
philosophy need to be resolved. Despite the barriers, a positive move has been led by
public-sector clients in building the partnering concept in supply chain management (Saad
et al., 2002). Khalfan and McDermott (2006) had revealed that innovative partnering
procurement plays a great role in the supply chain integration, where the target goals can
Context-Aware Services Delivery in the Construction Supply Chain
33
only be achieved through procurement policy developed by the client. Interesting results
were identified by Briscoe et al. (2001) when examining the level of skills, knowledge and
attitude among the workforce in the UK. The results had revealed that soft issues are still
low and need to be increased to a greater level especially in this era of information
technology advancement. In another investigation on supply chain integration in the UK,
Briscoe and Dainty (2005) had revealed that there is a limitation in partnering integration
within groups of client and main contractors with their subcontractors and suppliers group
due to lack of trust. Lu et al. (2006) revealed that the concept of partnering in construction
has become more interesting in recent years especially in developed countries such as the
UK, USA and Australia. The practice not only benefits all the stakeholders but under some
circumstances this concept fails to achieve its goals due to lack of continuous improvement,
communication break down and lack of win-win attitude.
2.10 Logistics Services in Construction Supply Chain Management
In construction supply chain, procurement route and execution (ordering, reception,
transport and storage) will determine the path of logistics processes. Traditionally, the
main contractor in a project is responsible for their individual supply chain to provide
materials and services required from off-site to on-site (Fig. 2-10). At the present time of
well-developed market for building materials and services, centralising and outsourcing the
Decision to partnering
Monitoring performance Dispute avoidance/resolution Achieving continuous
improvement
Auditing
Selection process
Initiating the partnering
process
Coaching and Training Establish
culture change
Advertisement
Questionnaire
Interviews
Forms of agreement
Fig. 2-9: The partnering process (reproduced from Smith (2002))
Context-Aware Services Delivery in the Construction Supply Chain
34
project supply logistics is seen as a more cost-efficient solution of facilitating project
control. With the introduction of new project delivery and management methods (e.g.
Partnering and PFI) and as the choice of suppliers is considered, traditional decision-
makers (project consultant and main contractor) are replaced with new ones: project
managers or even owners (Sobotka and Czarnigowska, 2005). As previously stated, the
construction supply chain network is a complex network consisting of multi-disciplined
groups and tasks which are difficult to manage. The tasks involve managing information
and material flows, plant operations and logistics through a common set of principles,
strategies, policies and performance index along the project life cycle. In this section, the
role of construction logistics in supporting the operation of CSC is discussed. Logistics is
known as the back bone for the construction supply chain management where it plays a
great role in optimising the flow of materials, equipment and people from the source of
supply to the specific on-site location (e.g. on-site storage) before loading to the point of
use. The operation flow mainly depends on the site location preparation. Some of the sites
do not have a specific material storage; therefore, the trade contractor needs to deliver the
component directly to the point of use as referred to the concept of JIT (Sullivan et al.,
2010).
Referring to the Council of Supply Chain Management Professionals (2008), logistics is
defined as “the process of planning, implementing and controlling the efficient, effective
flow and storage of goods, services and related information from point of origin to point of
consumption for the purpose of conforming to customer requirements”.
Fig. 2-10: Example of Logistics Operation of Building Material associated with CSC Activities
(Taylor and Bjornsson, 1999)
Context-Aware Services Delivery in the Construction Supply Chain
35
According to Hamzeh et al. (2007), logistics is able to create value within the supply chain
through managing customer service, orders, inventory, transportation, storage, handling,
packaging, information, forecasting, production planning, purchasing, cross docking,
repackaging, pre-assembly, facility location and distribution. Materials handling,
transportation and warehousing are known as the critical services that serve the logistics
operation processes (Fig. 2-11). These include services in optimising the movement of raw
materials, optimising the transportation mode, locating and designing facilities.
According to Jang et al. (2003), construction logistics can be divided into two parts,
namely: supply logistics and on-site logistics. The supply logistics focuses mainly on the
activities of production, transportation to a site and off-site and storage control; while site
logistics focuses mainly on the physical flow such as controlling on-site activities or
processes. Comparing to the manufacturing industry, construction logistics supply chains
are considerably more difficult to manage and optimise due to various factors such as
diversification of projects (i.e. various materials, methods and project location) and
technical complexity of a project.
A report ‘Improving Construction Logistics’ published by the Strategic Forum for
Construction (2005) revealed that quite a considerable amount of waste produced in the
construction is caused by poor management of materials delivery services (e.g. from
supply logistics to site logistics), inventory, communications and human resources. The
consequences of poor construction logistics are the following setback: about 30% of losses
Transportation
(People and Materials)
Construction
Logistics
First Aid
Material
Storage
Material
Receipt
Cleaning Communication Security
Traffic
Management
Fire
Marshalling
Material
Handling
Health and
Safety
Welfare
Waste
Management
Reception
Primary responsibilities and services Support responsibilities and services
Fig. 2-11: Generic construction logistics role (reproduced from Sullivan et al. (2010))
Context-Aware Services Delivery in the Construction Supply Chain
36
in overall construction cost, contributing to the bad image of the industry, poor quality of
product, increased project duration and added risks to workers’ health and safety.
2.11 Information and Communication Technology (ICT) in Construction
Logistics
In this section, three ICT technologies are described to demonstrate their use in supporting
construction logistics services.
2.11.1 Global Positioning System (GPS)
The GPS technology is well-known for providing moving maps for navigating airplanes
and automobiles. GPS is commonly deployed in a variety of devices such as handheld GPS
receivers that provide latitude, longitude and altitude. The GPS consists of satellites in
located geostationary orbit around the Earth. These satellites remain in a fixed position
relative to the ground and continuously transmit coded beacon signals. A GPS receiver
located on a client receives simultaneous signals from multiple GPS satellites and uses a
time-based approach for calculating position. The successful reception of at least three
satellite signals is enough to calculate x-y coordinates to provide greater accuracy and
possible to determine elevation. An issue with GPS is that GPS signals are relatively weak,
making it only usable in areas with an unobstructed path between the GPS receiver and the
user (Ashbrook and Starner, 2002). Even narrow areas surrounded by tall buildings, such
as within large cities, will reduce signal reception quality as reported by Lu et al. (2006) in
their study of real-time monitoring of ready-mixed concrete (RMC) delivery in congested
city area (Fig. 2-12).
Fig. 2-12: Process of RMC delivery with truck mixers (Lu et al., 2006)
Context-Aware Services Delivery in the Construction Supply Chain
37
2.11.2 Radio Frequency Identification (RFID)
RFID tag is built with a memory chip that identifies and, by wireless, communicates data
(i.e. stored information) such as date, location and name to information systems. RFID
system is one of the most anticipated technologies capable of transforming construction
operations and enable on-site engineers to integrate seamlessly the work processes at job
sites in an efficient way (Wang et al., 2007). There are two types of RFID tags, namely:
Active and Passive. Active tags need batteries to operate and can be read within the range
of about 6 metres while Passive tags do not use batteries; they use radio waves generated
from a reader to activate the tags. The reading capability for Passive tags is less than one
metre. The RFID reader acts as a transmitter/receiver. The tag then transfers data to the
reader through an antenna. These data are then read by the RFID reader and transferred to
Pocket PC or computer (Fig. 2-13).
Fig. 2-13: RFID operational system
From various reviews published in research journals and websites, there are a number of
potential application areas for RFID technology including component tracking, inventory
management, equipment monitoring and maintenance applications. Materials tracking
management systems are able to provide site managers with the ability to determine
construction progress and materials delivered from centralised reports or simply by
walking around a site where all materials are identified and tagged using an RFID system.
Among the clear benefits of RFID system are as follows:
Overcome wastage of materials, theft and check-in waiting times for material.
The use of agent software is able to enhance communications between both off-site
and on-site parties via the internet and the supplier’s website or e-mail address as
soon as the material is sent through the delivery gate.
Context-Aware Services Delivery in the Construction Supply Chain
38
Multiple handling of documents is significantly reduced because there are no
invoices for the delivery personnel to complete, as all are automated by the system.
Information is in electronic form and includes instructions such as delivery
procedure.
These three benefits can be referred to Fig. 2-14, where the RFID system is integrated with
Wireless Local Area Network (WLAN) system to increase the accuracy and information
communication speed in the construction supply chain in tracking material delivery from
the point of source to the point of use (Wang et al., 2006). Meanwhile, Fig. 2-15 and Fig.
2-16 show RFID technology as part of the InHaus2 project that used an integrated ICT
infrastructure supported by WLAN system in creating an intelligent construction site
logistics (Wessel, 2008). This experiment revealed the limitations of RFID as follows:
The scanning performance rate was low due to high attenuation of Radio Frequency
(RF)
Only some of the tags could be scanned within the designated range.
RFID tags needed to be robust in order to sustain the construction environment.
Fig. 2-14: The application of RFID-enabled PDA for material tracking (Wang et al., 2006)
Context-Aware Services Delivery in the Construction Supply Chain
39
Fig. 2-15: A truck carrying tagged material
elements passes an UHF RFID gate
(Wessel, 2008)
Fig. 2-16: Facade elements crates with RFID
tags (Wessel, 2008)
Other weaknesses of RFID as published by Ekahau White Paper (2006) are as follows:
RFID lacks much in computing power which is a necessary element to perform in
dynamic tracking.
The accuracy in scanning the position of entity much depends on the location of the
scanner installed within the environment.
Lack of flexibility due to changing environment in complex indoor environments.
This is due to the fact that RFID scanners/readers need to be remounted and
rewired when such changes take place especially in warehousing environments.
Radio frequency interference with wireless LAN in same facility could limit the
full capability of the RFID system.
2.11.3 Real-Time Location System (RTLS)
Real-Time Location System (RTLS) can be classified as part of context-aware technology
that uses location as a context parameter in order to provide relevant information and
services about asset mobility (e.g. people, equipment and in-progress component) to the
respective user(s). This system has supported many industries in the modern world ranging
from medical to airport to logistics services (Appear, 2010; CISCO, 2010; Ekahau, 2010).
The potential of integrating RTLS with dedicated context-aware application in the
construction industry had been researched by Aziz et al. (2006), Behzadan et al. (2008) and
Fathi (2009). For on-site application, they had proposed using RTLS to track and relay the
location of mobile workers such that information can be delivered relevant to the user, for
Context-Aware Services Delivery in the Construction Supply Chain
40
example updating the logistics manager of the status of material delivery. In capturing the
physical contexts, wireless sensor technologies such as Wi-Fi tags and Wi-Fi enabled
smartphones can relay data to the positioning system in order to define the user’s exact
location in real-time (Ekahau, 2010). Fig. 2-17 shows the proposed concept of RTLS
capability in supporting on-site construction services and Fig. 2-18 shows how the user can
monitor in real-time any asset mobility within the designated zone via web-based services
user interface.
RTLS
User and Wireless
Devices
Wireless System
Infrastructure
Location-based Context-Aware
System and Integration
3rd Party
Applications
Solution Provider
Applications (e.g.
Management Software etc)
Web Services Interface HTTP-XML API
Via Internet
Web Services Interface HTTP-XML API
Via Internet
RTLS Server
Wireless Access Point +
Wireless Location
Receiver + Signal Exciter
Fig. 2-17: The Concept of Wi-Fi Location-based Context-Aware Mobility Deployment
Architecture for Construction Logistics
(adapted from Aziz et al. (2006); CISCO (2010); Ekahau (2011))
Context-Aware Services Delivery in the Construction Supply Chain
41
Fig. 2-18: Ekahau Vision Software in presenting mobile assets location movement within
designated Wi-Fi zone (Ekahau, 2012)
The detailed review of RTLS system can be referred to in Chapter 3. In terms of location
tracking capabilities, some basic comparisons between GPS, RFID and RTLS can be
summarised in the following Table 2-1.
Table 2-1: Usage comparison between GPS, RFID and RTLS
(Behzadan et al. (2008); Ekahau (2012))
GPS RFID (Passive Type) RTLS (Wi-Fi based)
Description Outdoor location tracking
technology for global
tracking
Electronic identification
technology that uses small,
inexpensive wireless tags
Active tags that are used for
locating high-value assets
and people in real-time,
enterprise-wide
Accuracy +10 metres High when near or next to
RFID reader
Typically between 1 to 3
metres
Usage Smartphone consumer
applications, car navigator,
construction (e.g.
earthworks)
Warehousing, retail, other
logistics purposes
Asset management, staff
safety, consumer tracking.
2.12 Summary
From literature, it shows that the construction industry is difficult to manage due to its
high-fragmentation nature. Effective cross-discipline communication among the supply
chain network is critical for a successful information and services delivery. In supply chain
management, three components define the network operations, namely: the flow of
information, the flow of material and the flow of fund. A construction supply chain model
RTLS Wi-Fi
designated zone
Asset mobility
current location
Context-Aware Services Delivery in the Construction Supply Chain
42
framework is difficult to develop. As part of the supply chain network, construction
logistics is seen as a critical service component to the whole construction project especially
in managing on-site material operations. ICT plays a vital role as a driving tool in activities
of managing and controlling construction supply chain services. Realising the concept of
construction supply chain integration using context-aware integrated with web services is
part of the current research. This concept could ensure that each construction task is
provided with access to context-specific data, information and services.
The next chapter explains the context-aware and web services technologies.
Context-Aware Services Delivery in the Construction Supply Chain
43
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