The Effect of Software Size Uncertainty on Effort Estimates Generalized by Alpha Times I to the Beta Power Software Resource Models.

Abstract

In support of the Cost Technical Center's estimate of the North Atlantic Defense System (NADS) software development effort, a new probability model, the Analytic Software Effort Probability (ASEP) model, has been developed that quantifies the impact of software size uncertainty on effort estimates generated by Alpha I Beta software resource models. This paper provides the mathematical foundation of the ASEP model. Analytic equations that yield the exact density, cumulative distribution, mean, and variance of the development effort, given that the size of a single Computer Software Configuration Item(CSCI) is a uniform or triangularly distributed random variable, are described. These equations are extended to the case of approximating the overall development effort mean, variance, and distribution for a system consisting of multiple CSCIs.

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Document Details

Document Type
Technical Report
Publication Date
Nov 01, 1987
Accession Number
ADA189209

Entities

People

  • Paul R. Garvey

Organizations

  • MITRE Corporation

Tags

Communities of Interest

  • Human Systems

DTIC Thesaurus Topics

  • Air Force
  • Classification
  • Computer Programming
  • Computer Programs
  • Computers
  • Corporations
  • Defense Systems
  • Distribution Functions
  • Monte Carlo Method
  • Plastic Explosives
  • Probability
  • Probability Density Functions
  • Probability Distribution Functions
  • Probability Distributions
  • Random Variables
  • Software Development
  • United States

Fields of Study

  • Computer science
  • Engineering

Readers

  • Life Cycle Cost Analysis
  • Regression Analysis.
  • Software Engineering.