NASA-Systems Engineering

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Unformatted text preview: ermined by management's desire to have visibility into costs, balanced against the cost of planning and reporting. Contractors may have a Contract WBS (CWBS), which is appropriate to the contractor's needs to control costs. A summary CWBS, consisting of the upper levels of the full CWBS, is usually included in the project WBS to report costs to the contracting organization. WBS elements should be identified by title and by a numbering system that performs the following functions: • • • Identifies the level of the WBS element Identifies the higher level element into which the WBS element will be integrated Shows the cost account number of the element. NASA Systems Engineering Handbook Management Issues in Systems Engineering A WBS should also have a companion WBS dictionary that contains each element's title, identification number, objective, description, and any dependencies (e.g., receivables) on other WBS elements. This dictionary provides a structured project description that is valuable for orienting project members and other interested parties. It fully describes the products and/or services expected from each WBS element. This section provides some techniques for developing a WBS, and points out some mistakes to avoid. Appendix B.2 provides an example of a WBS for an airborne telescope that follows the principles of product-based WBS development. 4.3.1 Role of the WBS A product-based WBS is the organizing structure for: • • Project and technical planning and scheduling Cost estimation and budget formulation. (In particular, costs collected in a product-based WBS can be compared to historical data. This is identified as a primary objective by DoD standards for WBSs.) • Defining the scope of statements of work and specifications for contract efforts • Project status reporting, including schedule, cost, workforce, technical performance, and integrated cost/schedule data (such as Earned Value and estimated cost at completion) • Plans, such as the SEM...
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This document was uploaded on 02/26/2014 for the course E 515 at University of Louisiana at Lafayette.

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