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.
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References
Boehm, B. W., Software Engineering Economics, Prentice-Hall, Inc., Englewood Cliffs, NJ, 1981.
Funch, P. G., “Recalibration of Basic and Nominal COCOMO Equations to Recent Air Force Acquisitions,” presented at the Third Annual COCOMO Users’ Group Meeting, Pittsburgh, PA, 3–5 November 1987.
Wolfinger, B. E., “Calibrating COCOMO for Ada,” presented at the Third Annual COCOMO Users’ Group Meeting, Pittsburgh, PA, 3–5 November 1987.
Pullen, K. W., “Uncertainty Analysis with COCOMO,” presented at the Third Annual COCOMO Users’ Group Meeting, Pittsburgh, PA, 3–5 November 1987.
Keefer, D.L., S. E. Bodily, “Three-Point Approximations for Continuous Random Variables,” Management Science, Vol. 29, pp. 595–609 (1983).
“Risk and Uncertainty,” Section IV in Cost Analysis, G. R. McNichols, ed., selected papers from the symposium, “Operations Research in Cost Analysis,” Arlington, VA, 18–20 May 1983; publ. by the Operations Research Society of America, 1984.
Garvey, P. R., F. D. Powell, “Three Methods for Quantifying Software Development Effort Uncertainty,” pp. 292–306 in Software Risk Management, B. W. Boehm, ed., an IEEE tutorial, publ. by the IEEE Computer Society Press, Washington, DC, 1989.
Bratley, P, B. L. Fox, L. E. Schrage, A Guide to Simulation, 2nd ed., Springer-Verlag, New York, NY, Berlin, 1987.
Lilliefors, H. W., “On the Kolmogorov-Smirnov Test for Normality with Mean and Variance Unknown,” Journal of the American Statistical Association, Vol. 62, pp. 399–402 (1967).
Liffiefors, H. W, “On the Kolmogorov-Smirnov Test for the Exponential Distribution with Mean Unknown,” Journal of the American Statistical Association, Vol. 64, pp. 387–389 (1969).
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© 1991 Springer-Verlag New York Inc.
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Stein, W.M. (1991). A Methodology for Assessing Schedule Risk in Software Development Estimates. In: Kankey, R., Robbins, J. (eds) Cost Analysis and Estimating. Springer, New York, NY. https://doi.org/10.1007/978-1-4612-3202-5_6
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DOI: https://doi.org/10.1007/978-1-4612-3202-5_6
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