INTRODUCTION WORK BREAKDOWN STRUCTURE

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Presentation transcript:

INTRODUCTION WORK BREAKDOWN STRUCTURE Lecture 6 INTRODUCTION WORK BREAKDOWN STRUCTURE Ferdinand Fassa

Outline Review Lecture 5 What is a Work Breakdown Structure? Why is a Work Breakdown Structure needed? Preparing a WBS Building a WBS: Structure Work Breakdown Structure (WBS) Tree Organization Breakdown Structure (OBS)

Review Module 5 Project Organization

What is a Work Breakdown Structure? The Work Breakdown Structure (WBS) is A tool that defines A project is breakdown into A group of activities. A representation of the detailed project scope statement that specifies the work to be accomplished by the project.

What is a Work Breakdown Structure? A WBS element may be: A product, Data, A service, or Any combination.

Why is a Work Breakdown Structure needed? Not all projects have a WBS, So why is a WBS needed? Provides a framework for organizing and managing the approved project scope Helps ensure you have defined all the work that makes up the project Provides a framework for planning and controlling cost and schedule information It’s better to be deliberate about planning than rely on luck!

Preparing a WBS In preparing a WBS there are a number of steps that need to be taken including: identifying the final project product Divide the total work of the project into major groups Subdivide these groups into tasks Divide these tasks into sub-tasks Subtasks should be small enough to permit adequate control and visibility

Example of WBS: “Holiday” travel documents booking household passport tickets choose resort confirm Feeding the cat! brochures insurance Chapter 5 Planning

List of activities Booking: get brochures choose resort make booking confirm booking Travel documents: check passport book tickets get insurance Household: feeding the cat!

Example WBS Redecorate Room Prepare materials Buy paint Buy a ladder Buy brushes/rollers Buy wallpaper remover Prepare room Remove old wallpaper Remove detachable decorations Cover floor with old newspapers Cover electrical outlets/switches with tape Cover furniture with sheets Paint the room Clean up the room Dispose or store left over paint Clean brushes/rollers Dispose of old newspapers Remove covers WBS

Building a WBS: Structure The ACME Housing Corporation, which you own, has been contracted to build its first house. Start the WBS with ACME in the highest position, or Level 1. Accordingly, Level 1 is given a WBS code of 1. You assign the WBS code of 1 to the highest level because all future projects (houses) will be summarized at Level 1. NOTE: For ease of explanation, our example will assume the following: Design is complete All permits issued All Material ordered Inspection happens Level 1 

WBS: Structure With Level 1 established, you can begin to complete the WBS. Level 2 is identified at the project level: House. Appropriately, the code for Level 2 corresponds to Level 1. In this case, the code is 1.1. Level 1  Level 2 

WBS: Structure You choose to divide Level 3 into six elements: concrete, framing, plumbing, electrical, interior and roofing. Notice the WBS codes at level 3. Each is unique to the project and starts with the WBS code from the level above (11.11.1.1). Now lets look and see if another level is needed. Level 1  Level 2  Level 3 

WBS: Structure Level 4  Level 3   Level 1  Level 2 Level 4 of the WBS will enable us to manage the project as desired

Work Breakdown Structure (WBS) Tree 1 ACME Housing Corporation 1.1 New Home Construction 1.1.1 Concrete 1.1.1.1 Pour Foundation 1.1.1.2 Install Patio 1.1.1.3 Pour Stairway 1.1.2 Framing 1.1.2.1 Frame Exterior Walls 1.1.2.2 Frame Interior Walls 1.1.2.3 Install Roofing Trusses 1.1.3 Plumbing 1.1.3.1 Install Water Lines 1.1.3.2 Install Gas Lines 1.1.3.3 Install B/K Fixtures 1.1.4 Electrical 1.1.4.1 Install Wiring 1.1.4.2 Install Outlets/Switches 1.1.4.3 Install Fixtures 1.1.5 Interior 1.1.5.1 Install Drywall 1.1.5.2 Install Carpets 1.1.5.3 Install Painting 1.1.6 Roofing 1.1.6.1 Install Felt 1.1.6.2 Install Shingles 1.1.6.3 Install Vents The graphical structure of the WBS is an easy way to identify the project components and relationships of those components. WBS can be displayed in another format as well: the Tree format. Both formats are acceptable. Note the WBS codes and the structure of the Levels in the Tree format mirror the graphical format. The content has not changed; only the way the content is presented has changed.

Organization Breakdown Structure (OBS) After WBS is developed: Resources and responsibilities need to assigned. The first step in doing this is developing the Organizational Breakdown Structure (OBS) for the project. The OBS indicates the organizational relationships and is used as the framework for assigning work responsibilities. CONCRETE PERF DEPT 6010 M. Manning MASONRY PERF DEPT 6020 T. Greams TEST PERF DEPT 6030 K. Neumann CIVIL RESP DEPT R. Kelly CARPENTRY PERF DEPT 5010 R. Sites ROOFING PERF DEPT 5020 Y. Taylor DRYWALL PERF DEPT 5030 D. Smith STRUCTURAL P. Tate PERF DEPT 4010 S. Johnson HOOKUP/TIE-IN PERF DEPT 4020 P. Ottis ELECTICAL J. Sims WATER/SEWER PERF DEPT 3010 K. Wells GAS PERF DEPT 3020 R. Oriely PLUMBING R. Lee PROJECT OFFICE B. Smithers WIRING

Conclusion WBS is a tool that defines a project and groups the projects elements in a way that helps organize and define the total work scope of the project In preparing a WBS there are a number of steps that need to be taken including: identifying the final project product Divide the total work of the project into major groups Subdivide these groups into tasks Divide these tasks into sub-tasks Subtasks should be small enough to permit adequate control and visibility

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