8/9/2019 1_Definition and Measurement of Productivity
1/18
Basic Concept in Construction ProductivityEnhancement
Zeng Han Jun / Chew Boon Hur
Construction Productivity Centre
[email protected] / [email protected]
Copyright © March 2013 Building and Construction Authority
8/9/2019 1_Definition and Measurement of Productivity
2/18
Definition and Measurement of Productivity
Zeng Han Jun / Chew Boon Hur
Construction Productivity Centre
[email protected] / [email protected]
Copyright © March 2013 Building and Construction Authority
8/9/2019 1_Definition and Measurement of Productivity
3/18
Disclaimer
Important note: Information presented during this sharing session and
all materials in these slides are for the purpose of the sharing only and
NOT meant for any other purposes. If you wish to use the materials for
any purpose, please seek the consent of the Building and Construction
Authority (BCA).
Copyright © March 2013 Building and Construction Authority
8/9/2019 1_Definition and Measurement of Productivity
4/18
Presentation overview
1 • Definition of Productivity
2 • Basket of Productivity Indicators
3 • Measurement of Project Productivity
4 • Usefulness of Trade Productivity Data
5 • Builders’ Guide on Measuring Productivity
6 • Case Study
Copyright © March 2013 Building and Construction Authority
8/9/2019 1_Definition and Measurement of Productivity
5/18
Outline of this Module
Understand the definition and how tomeasure project & trade productivity
Introduction to the electronicProductivity Submission System
(ePSS)
Copyright © March 2013 Building and Construction Authority
8/9/2019 1_Definition and Measurement of Productivity
6/18
Definition of Productivity
“A measure of the efficiency of person, machine, factory, system,etc., in converting inputs into useful outputs.”
Copyright © March 2013 Building and Construction Authority
8/9/2019 1_Definition and Measurement of Productivity
7/18
Basket of Productivity Indicators
Level
Indicators
Industry Value Added Productivity (VAP)
$million of construction output per 1000foreign workers
Company VAP
Project m2 / man-day (floor constructed per man-day)
Trade
m2/man-hour (e.g. area of dry-wall installed)
m/man-hour (e.g. length of wiring or ductinginstalled)
Copyright © March 2013 Building and Construction Authority
8/9/2019 1_Definition and Measurement of Productivity
8/18
8
Company VAP
Value Added of a firm includes total remuneration, operating profit before tax,depreciation, indirect taxes & levies.
Calculator available at
BCA Website
Copyright © March 2013 Building and Construction Authority
8/9/2019 1_Definition and Measurement of Productivity
9/18
Measurement of Project
Productivity• Unit: Square meter of floor area completed per
manday
• 1 manday is defined as 1 man working for 8 hours
Project productivity =
Total constructed floor area (m2)
Total number of site workers (mandays)
Copyright © March 2013 Building and Construction Authority
8/9/2019 1_Definition and Measurement of Productivity
10/18
Trade Level Productivity
At the trade level, the amount of output per labour houris measured
Total units of output
Total manhoursTrade Productivity =
Copyright © March 2013 Building and Construction Authority
8/9/2019 1_Definition and Measurement of Productivity
11/18
Major TradesStructural • Formwork installation
• Steel bars fixing• Concrete placement
Arch • Wall
• Tiling• Painting• Door• Window• Ceiling
M&E • Electrical system
• Air-conditioning system• Plumbing system
Which Trades To MeasureManpower used in a building project
Total manpower used for majortrades is about 80%
Structural35% - 45%
Architectural25% - 35%
M&E
15% - 30%
Health & Safety8%
Copyright © March 2013 Building and Construction Authority
8/9/2019 1_Definition and Measurement of Productivity
12/18
Usefulness of trade productivity data
• For builders:
1. To plan their manpower and benchmark their
trade productivity
2. As reference for builders3. For benchmarking and comparison purposes (e.g.
painting with rollers vs more productive spray
painting)
Copyright © March 2013 Building and Construction Authority
8/9/2019 1_Definition and Measurement of Productivity
13/18
• A guide to help builders
measure productivity of
various trades
Builders’ Guide on
Measuring Productivity
Copyright © March 2013 Building and Construction Authority
8/9/2019 1_Definition and Measurement of Productivity
14/18
Copyright © March 2013 Building and Construction Authority
8/9/2019 1_Definition and Measurement of Productivity
15/18
Copyright © March 2013 Building and Construction Authority
8/9/2019 1_Definition and Measurement of Productivity
16/18
Trade productivity monitoring form
Copyright © March 2013 Building and Construction Authority
8/9/2019 1_Definition and Measurement of Productivity
17/18
Case Study - Drywall installation
Activity Time
taken(manhour)
i. Transporting of materials to location(exclude crane downtime)
ii. Setting outiii. Preparation of drywall materialsiv. Installation of drywall
v. Sealing of joints
0.67
0.670.674.33
0.33
Total 6.67
Description
Location: Blk123 #05-13 (LivingRoom)
Area of drywall: 15m2 Floor height: 3m
Manpower
Tradesman: 4 men
Mobile crane operator: 1 manSafety and health worker: 2 men
Trade Productivity = Area of drywall installed (m2)
Total time taken (manhour)
= 15 m
2
= 6.67 manhour
= 2.25 m2 /manhour
Copyright © March 2013 Building and Construction Authority
8/9/2019 1_Definition and Measurement of Productivity
18/18
Thank you
Copyright © March 2013 Building and Construction Authority