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estimating project Cost Using ISBSG Data
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3 Determine the appropriate project delivery rate for the software component (effort hours per function point) 4 Calculate the effort (PDR Predicted Delivered Size = Total Software Effort Hours) 5 Steps 1 through 4 need to be completed for each software component to determine the Total Effort Hours 6 Determine the project team role profile, and allocate the percentage contributions for each role 7 Allocate effort hours to each role using the percentage contribution (Total Project Effort Hours % Role Contribution = Hours for Role)
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8 Determine the charge-out rate for each role 9 Calculate the cost of the effort for each role (Role Charge-Out Rate Effort Hours for Role) allowing for currency movements and inflation if applicable
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10 Sum the Project Cost for each role to calculate the Total Project Cost based on PDR
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Additional Steps to Calculate Non-PDR-Related Project Costs
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11 Calculate the costs for activities not included in the ISBSG Project Activities in Table 15-1 12 Calculate the costs for people to be paid for by the project budget but whose effort was not included in the PDR-derived effort, typically Level 2 and above 13 Total the costs for steps 10 through 12 to determine total costs for input into the project budget
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Note The figure calculated in Step 13 is the most likely project cost
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Project cost estimates should not be presented as a single number but always as a range for example, best case, likely case, worst case in order to appropriately manage expectations and to obtain approval for realistic budget allocations
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Creating a Software project estimation Framework Using the ISBSG repository
key solution to the problem of poor software project estimation is to create a software project estimation framework for your development team A software project estimation framework comprises a set of templates or tables, combined with a supporting procedure, that allow you to estimate the effort and duration of a software project Once you have established an estimation framework, you can enter measures of the scope for a new project into the framework to obtain a project effort and duration estimate If you have an environment where your development team has developed multiple projects over a few years, then the ultimate estimation framework is one based on data from the team s past projects, in other words, your organization s own software measurement data However, few organizations have long-term development teams or more commonly the necessary skills to collect and maintain their own project history over several years So in the absence of an organization s own experience data, you can use past projects from a public project database such as the ISBSG Repository
Note A software project estimation framework comprises a set of templates
or tables, combined with a supporting procedure, that allow you to estimate the effort and duration of a software project
practical Software project estimation
You can use a number of sources of ISBSG data for your framework: The appendixes of this book You will find a set of project delivery rate tables showing PDR by category These tables have been derived from the ISBSG Repository The ISBSG Development and Enhancement Repository Release 11 of the ISBSG Repository contains data from over 5,000 software projects The ISBSG Special Report series of publications and the Web Subscription service These provide discussions on the factors that have a major impact on project delivery rate, duration, defect densities, and other topics1
Using the ISBSG PDR Tables to Create Tables for Your Estimating Framework
You can use the following procedure to establish an estimation framework using the ISBSG tables in Appendix B: 1 Identify which development platforms your software development group is likely to use on future projects 2 From Appendix B extract PDR distributions for your team s development languages for the relevant development platforms (Tables B-17, B-18, B-19, and B-20) 3 Next consider the impact of the likely project maximum team sizes on the PDR distributions 4 Examining the PDR distributions extracted will reveal that they are too broad for practical use Consequently, the next step is to refine them by benchmarking a small number (one to five) of your group s typical projects against the extracted PDR distributions 5 Finally, use the PDR values at the top and bottom of your group s benchmark quartile from each extracted PDR distribution to create the PDR tables for your estimation framework To estimate a specific project using the framework, you apply the following equation: Effort (in hours) = FPs PDR You measure FPs from whatever form of specification about project scope that you have available The level of detail in this specification
The ISBSG Special Reports are available to ISBSG web subscribers Reports are produced regularly based on analysis of the ISBSG data
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