Planning & Organising two

Introduction to WBSWork Breakdown

Structure

Presenter Tony BosnichAdapted from Taija Puolitaival

Oct 2014

© Unitec New Zealand

>>FACULTY OF TECHNOLOGY AND BUILT ENVIRONMENT

Learning out comeTo understand WBS Work breakdown Structure and its application to Construction Planning

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What is a WBS ?

• Work Breakdown Structure is a deliverable orientated hierarchical

decomposition of work to be executed by project team to

accomplish the project objectives • ( PIMBOK)

Lets consider this bit by bit!

• deliverable oriented – WBS focuses on work to be delivered rather than tasks needed to accomplish the work.

• Deliverable = Exterior works• Task s= landscape , paths, driveway, retaining

walls , lawnshierarchical – WBS is representing bigger chunk

of work at hierarchical manner starting with a node the top and then nodes representing smaller chunk as we move down

Activity 1 Individual

• Take the house plans as provided.• Compose the WBS for Level one• Level two Refer to Rawlinsons elemental breakdown hand-out provided• Level three for Element - substructure only• 15 minutes

“Build before we Build !”(BIM)1st part of the

Planning process

Maybe elemental or functional

Parts which make updeliverables

• Lets check our answers for activity 1• Next do the same for element super structure.• 10 minutes

Activity 2 Individual

• What are we doing by completing a WBS.• Remember from our Planning Intro

• Backwards Reasoning• Taking the end product and working backwards taking it a part

(Decomposing)• Purpose to analysis our WBS at each level then reassemble in

correct order to deliver outcome.

WBS

Decomposition! Decomposition!! Decomposition!!!

Key Rule:(a) 100% Rule: WBS includes 100% of the work defined

by the project scope and captures ALL deliverables – internal, external, interim – in terms of the work to be completed, including project management.

(Project Management Institute)

(b) Anything that is not defined in the WBS is outside the scope of the project.

(Haugan 2002)

WBS

Multi - functional

• Two fold as Project Managers• 1. Confirm and understand scope of works in this project.2. As Construction Planners, to arrive at a list of tasks to

transfer to our WBS template and work out durations

It is important to appreciate at which level of detail this transition occurs!

As Construction Professionals what are we trying to achieve by this WBS process?

• Thank you, any questions so far?

Having established our end use we can either stop here or continue on to the construction planning programming section.

We now know “WHAT “is scope of works!

Summary

The level of decomposition required and subsequent level of details will be dictated either by the number of tasks and parameters of the task durations.(Or possibly both)

As progress is made down decomposition pathalways consider the over all requirement of the programming requirement.

Part two - WBS for construction planners --the HOW bit!

• In residential it is fine to consider a WBS as only having one zone area or stage.

• However consider the set of plans for J block.• The scale is immediately larger.• Referring back to our planning session.

• Do we need to completely finish one task before we start next.????

Location Based WBS

• This puts your Planning into a more effective mode, it will also be necessary for BIM in future study.

Location Based WBS

WBS• Comprehensive

classification of project scope

• Contains no activity duration

• No resource assignments• No dependencies

Programme• Actual work to be done

• Contains activity durations• Contains assignment of

resources to tasks• Contains dependencies

WBS / Programme Distinction

1. Nature of the work/homogeneity2. Location/floor3. Size/duration4. Timing/chronology5. Responsibility6. Others7. At the level that baton passes to the programmer

some form of staging or phasing will be introduced.

Determining work activities -Factors to be considered

(Mubarak 2010)

= measurable piece of work and a single responsibility

• Single discrete scope of work• Definite start and end• “mini projects”

Work package - Or task/Activity

(Hinze 2012)

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Tasks –an individual item or sub project of work by a single person, trade or organisation , which when combined with other tasks in the correct sequence and relationship will result in an event occurring.

Components of Task - Description - Duration - Relationship with other tasks

Note - a task achieves nothing in isolation it is only when it is combined with other tasks its purpose

becomes clear

Activity 3 Commercial Drawing - use visio or another form of electronic flow chart

• Task 1 • Task 2

WBS for LoD1 TotalLoD2 ElementalLoD3 location

• Complete WBS• LoD4 for sub

structure only for all zones

30 minutes - Put on USB and sample present to class but all teams must submit to lecturer for review.

Group exercise

Logical patternAccording to company’s policyNational coding systems, (for QS CBI ,Co-ordinated

Building Information, www.masterspec.co.nz

Name of the project LocationType of activity…If using MS project it is advisable to ignore coding

and let MSP WBS coding system prevail.

Determining of work activitiesUnique identity (ID)

• Well defined tasks (no less than one day)

• Clearly defined deliverables such that:• Cost/time is easily estimated• Outputs can be measured (clear and

quantifiable)• Progress tracking (monitor & control)

is facilitated

The End Point - the main objective of a WBS

• Haugan, G.T. (2002). Effective Work Breakdown Structures (The Project Management Essential Ibrary Series). USA: Management Concepts Inc.

• Hinze, J.W. (2012). Construction Planning and Scheduling. New Jersey: Pearson Education.

• Mubarak, S. (2010). Construction project scheduling and control (2nd edition). Hoboken, New Jersey: John Wiley & Sons.

• Project management Institute (Practice Standard for Work Breakdown Structures (Second Edition), Project Management Institute.

• Wysocki R. K. , McGary R. (2003). Effective Project Management (Third edition) Hoboken, New Jersey: Wiley Publishing.

• Taija Puolitaival - lecturer Unitec

• Chris Prigg - lecturer Unitec

References