APPROACHES TO BUILDING A WBSAPPROACHES TO BUILDING A WBS

BUILDING A WBS :BUILDING A WBS :

WBS is the key work product needed to do software project to selection as WBS is the key work product needed to do software project to selection as a framework for estimating. There is atop-down & a bottom up approach to a framework for estimating. There is atop-down & a bottom up approach to building any WBS.building any WBS.

WBS constructing a five steps. They are WBS constructing a five steps. They are

Identify the work concerning the software product.Identify the work concerning the software product.

Find any higher system WBS.Find any higher system WBS.

Determine the software WBS architecture.Determine the software WBS architecture.

Populate the software WBS architecture.Populate the software WBS architecture.

Determine cost categories for software.Determine cost categories for software.

APPROACHES TO BUILDING A WBS:APPROACHES TO BUILDING A WBS:

• A WBS can be organized in many ways . Its usually best to arrange the A WBS can be organized in many ways . Its usually best to arrange the activities around major work products & customers requirements.activities around major work products & customers requirements.

The hierarchical “tree” of information isThe hierarchical “tree” of information is

The compiler.The compiler.

The basic parts of the compilerThe basic parts of the compiler

The steps of the development process to build the basic The steps of the development process to build the basic parts of the compilerparts of the compiler

• WBS branches directly correlated to deliverable to be produced. organizing a WBS branches directly correlated to deliverable to be produced. organizing a WBS around deliverable and the action to produce those deliverables helps WBS around deliverable and the action to produce those deliverables helps keep unnecessary work from being done on the project.keep unnecessary work from being done on the project.

• WBS around the projects deliverables and work produt is good way to avoid WBS around the projects deliverables and work produt is good way to avoid planning extra work into the project. Several possible arrangements for WBS.planning extra work into the project. Several possible arrangements for WBS.

The basic element of the project.The basic element of the project.

Other element could also be used ,such as deliverables, skills, Other element could also be used ,such as deliverables, skills, responsibilities .responsibilities .

WBS have include hardware , software & business process.WBS have include hardware , software & business process.

The WBS can be created from top down and bottom up approaches .The WBS can be created from top down and bottom up approaches .

Top down approach involves successive decomposition.Top down approach involves successive decomposition.

Bottom up approach uses brain storming & affinity diagramming.Bottom up approach uses brain storming & affinity diagramming.

The big components of work that will need to be done and to make The big components of work that will need to be done and to make Rough Order of Magnitude (ROM).Rough Order of Magnitude (ROM).

It is based on Broad Rule of thumbIt is based on Broad Rule of thumb..

Top down approaches:Top down approaches:

Its involves starting with the top most item and breaking it down from Its involves starting with the top most item and breaking it down from

there , getting progressively more granular at each level.there , getting progressively more granular at each level.

It work that can reasonably done by “one unit of resource” in a relatively It work that can reasonably done by “one unit of resource” in a relatively “short period time” have reached“short period time” have reached

Bottom up approach:Bottom up approach:

It is good fit for a new type of project, when the project team is not very It is good fit for a new type of project, when the project team is not very familiar with the steps that would be performed.familiar with the steps that would be performed.

Its during the project and then grouping the activities into level of Its during the project and then grouping the activities into level of granularity and arranging all the activities into ever higher grouping until granularity and arranging all the activities into ever higher grouping until the top level item is reached.the top level item is reached.