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A Methodology for Assessing Schedule Risk in Software Development Estimates

In: Cost Analysis and Estimating

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  • William M. Stein

    (The MITRE Corporation)

Abstract

Planning estimates for software development schedules are often obtained using a schedule-estimating equation that expresses the schedule estimate (in calendar months) as a nonlinear function of the total development effort (in staff-months). For example, the COCOMO schedule model [1] for embedded-mode developments is Schedule = 2.5 (Effort)0.32 We address the problem of measuring the error of uncertainty in the schedule estimate when the error of the effort estimate and the error of the schedule model (given actual effort data) are known. We illustrate the methodology for two models calibrated to historical cost data.

Suggested Citation

  • William M. Stein, 1991. "A Methodology for Assessing Schedule Risk in Software Development Estimates," Springer Books, in: Roland Kankey & Jane Robbins (ed.), Cost Analysis and Estimating, chapter 6, pages 118-142, Springer.
    • Handle: RePEc:spr:sprchp:978-1-4612-3202-5_6
    DOI: 10.1007/978-1-4612-3202-5_6
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