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Copyright 2000 GTA
Last Modified 01/22/06

5 Software Size Estimation Tips


  • Analyze similar, past projects to generate the historical data needed to estimate the size of new software projects. Relying on memory is not effective and leads to poor estimates.
  • Include data gathered from software and test team members. Early project team involvement, not only serves to improve the accuracy of the estimate, but also prepares the team for the eventual project start date.
  • Keep in mind that experience is the key to effective software size estimation. The larger the project, the more experience required to make a good estimate.
  • Use multiple estimation techniques. During the initial estimation stage, the comparative results of different estimation techniques provides the best estimate.
  • Revise the initial size estimate as new information becomes available. During the design phase as the major software pieces come into focus, each module can be estimated separately, the sum of which reflects a revised, more accurate estimate.


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