Upgrading the Space Shuttle by Committee on Space Shuttle Upgrades

Author:Committee on Space Shuttle Upgrades
Language: eng
Format: epub
Tags: Space and Aeronautics : Space Systems and Hardware
Publisher: NATIONAL ACADEMY PRESS
Published: 1999-01-21T00:00:00+00:00

Third, cost estimates for upgrades must be accurate. Inaccurate cost estimates are a particular problem for projects involving a large amount of new software. Government cost estimates for software have been notoriously inaccurate, often underestimating costs by as much as an order of magnitude. This cost increase is typically attributable to an increase in lines of code by a factor of 2 to 3 (see Figure 3-1) and a decrease in the productivity of individual programmers by a factor of 3 to 4 (see Figure 4-1 and associated text).

Recommendation 7. All calculations, comparisons of costs and cost savings, and cost-benefit assessments done by NASA, as well as its DSS independent contractor, should be performed using fixed-year dollars and should include all costs (including hidden costs) associated with the upgrade.

Figure 3-1

Risk in estimating lines of code. Source: The Aerospace Corporation, 1998.

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