Guia do wbs

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Program/Project Management Series

Work Breakdown Structure Reference Guide

National Aeronautics and

Space Administration

May 1994

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Work Breakdown Structure Reference Guide

May 1994

Table of Contents
iii Chapter 1: WBS Basic Information Definition WBS Types Program/Project WBS Contract WBS Guidelines Summary Chapter 2: WBS Development and Maintenance WBS and the ProjectLife Cycle WBS Activities Development Considerations Compatibility of PWBS and CWBS Compatibility with Internal Organization Structure and Management Systems Correlation with Other Requirements Number of Levels PWBS Levels CWBS Levels Cost Accounts All Inclusiveness PWBS CWBS Change Control PWBS Development Contractor-Proposed PWBS Changes CWBS Development Techniques Coding of Elements PreparingDiagrams Preparing WBS Dictionary Using Checklists PWBS Checklist Contractor-Proposed PWBS Changes Checklist CWBS Checklist Common Development Errors Unsuitable Old WBS Error Non-Product Elements Error Functional Elements Error

1 2 2 3 5 6

7 8 9 9 9 10 10 10 10 10 12 12 12 12 12 13 13 13 13 14 14 14 15 15 16 17 17 17 17

May 1994

Work Breakdown Structure Reference Guide

Chapter 3:WBS Use Introduction Technical Management Specification Tree Configuration Management Integrated Logistic Support Test and Evaluation Work Identification and Assignment Schedule Management Plans Revisions Status Cost Management Cost Estimating Budgeting Accounting Analysis and Control Historical Database Development Performance Measurement Summary Appendix A: Glossary Appendix B: Acronym ListingAppendix C: PWBS Examples Appendix D: CWBS Examples Appendix E: WBS Section of NHB 7120.5

19 20 20 20 21 21 21 22 22 22 22 23 23 23 23 23 24 24 24 A-1 B-1 C-1 D-1 E-1

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Work Breakdown Structure Reference Guide

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About This Reference Guide
The work breakdown structure (WBS) is an effective tool in managing NASA programs and projects. It assists both NASA and contractors infulfilling management responsibilities. In accordance with NASA Handbook 7120.5, Management of Major System Programs and Projects, a WBS is mandatory for major system acquisitions and major projects, and will be used for other projects when practical. A WBS is required when performance measurement is applied to a contract. The purpose of this WBS reference guide is to support the completion ofprogram and project objectives within budget and schedule constraints. This reference guide can be used for various work efforts including research, development, construction, test and evaluation, and operations. The products of these work efforts may be hardware, software, data, or service elements (alone or in combination). A glossary (Appendix A) and an acronym listing (Appendix B) have beenincluded at the end of this reference guide.

May 1994

Work Breakdown Structure Reference Guide

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Work Breakdown Structure Reference Guide

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Chapter 1: WBS Basic Information
This chapter provides general work breakdown structure information including definition, types, guidelines and development process.

Definition
Each NASA program has aset of goals which are developed from NASA mission needs. These program goals are expanded into specific project objectives. The function of management is to plan and direct project activities to achieve the program goals. The purpose of a work breakdown structure (WBS) is to divide the program/project into manageable pieces of work to facilitate planning and control of cost, schedule and technicalcontent. A WBS is written early in program/project development. It identifies the total work to be performed and divides the work into manageable elements, with increasing levels of detail. The following example displays a portion of a WBS for a commercial aircraft project.

Aircraft WBS
AIRCRAFT

Structures
Management & Integration Primary Structure

Fuselage

Wings

Tail

Crew...
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