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Using the ISBSG Regression Equations
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Use of the ISBSG equations is straightforward Having selected the appropriate equation from the tables provided, to produce your estimate, you insert the calculated functional size of your project and (if available) the maximum team size For example, suppose you want to produce estimates for an enhancement project that is being developed for a multiplatform3 environment, and the project has a functional size of 260 function points, with a planned maximum team size of 4 Using Tables C-10,
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Refer to Appendix C for the equation tables
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estimating Using equations
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C-11, C-13, and C-14 from Appendix C, you would come up with the following estimates:
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Project Delivery Rate Project Work Effort Speed of Delivery (whole project) Speed of Delivery (per developer) PDRRE = 3897 Size 0566 TeamSize0951 PWERE = 3897 Size0434 TeamSize0951 SDRE = 044 Size0852 TeamSize 0228 SDRE = 044 Size0852 TeamSize 1228 = 3897 260 0566 40951 = 3897 2600434 40951 = 044 2600852 4 0228 = 044 2600852 4 1228 63 hours per function point 1,627 hours
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37 function points per month 92 function points per month per developer
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The following is an example of how to perform these equations using an MS Excel formula: =(3897*(260^ 0566)*(4^0951)) (For ^ press shift-6) Duration cannot be estimated directly from size and team size (no useful equations can be presented in Table C-12) Using the third row of Table C-22 leads to an estimated duration of 53 months The general equation relating effort to duration (see item 2b after Table C-22) gives an estimate of 42 months Dividing 260 FP by 37 FP per month (from the table immediately preceding this text) gives an estimate of 71 months So the estimates for this project indicate that it will consume around 1,600 hours of effort and have an elapsed time of approximately 5 to 7 calendar months
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Note It is very important to treat estimates obtained from the regression
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equations as ballpark figures only
Creating Graphs from the Equations
You can use the equations in Appendix C to create estimation charts for your environment For example, using the equation in Table C-21, Project Work Effort, estimated from software size only, for midrange platform & 4GL, you can create a simple MS Excel table, as shown next, for 50 through 1,000 function points, and then create a useful graph, as shown in Figure 7-1
practical Software project estimation
10,000 9,000 8,000 7,000 6,000 5,000 4,000 3,000 2,000 1,000 0
Effort (Hours)
300 400 500 600 700 800 Size (IFPUG Function Points)
1,000
Figure 7-1
Example Effort Estimation Chart, MR & 4GL
Class MF & 3GL MF & 4GL MR & 3GL MR & 4GL PC & 3GL PC & 4GL
C 5134 1839 4317 2907 1383 3105
E 0730 0838 0742 0830 0889 0710
N 365 41 71 47 140 50
R2 (Adj) 037 044 053 065 056 036
Median MRE 056 051 045 040 051 057
Note Effort includes project management, administration, and the
software team
Example Effort Estimate Using the Equations
Using Table C-21 in Appendix C, the effort equations derived from the ISBSG s data for the different combinations of platform and development show the following ballpark effort estimates for a project of 500 function points:
Platform and Language MF & 3GL MF & 4GL MR & 3GL MR & 4GL PC & 3GL PC & 4GL Multi & 3GL Multi & 4GL Estimated Effort for 500 FP Project 4,794 person hours 3,360 person hours 4,343 person hours 5,053 person hours 3,469 person hours 2,561 person hours 4,191 person hours 3,470 person hours
Effort Equation Effort = 5134*FPSize0730 Effort = 1839*FPSize Effort = 4317*FPSize Effort = 2907*FPSize
0742 0830
Effort = 1383*FPSize0889 Effort = 3105*FPSize Effort = 2396*FPSize Effort = 1586*FPSize
0710 0831 0867
7:
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Note The effort predicted by the ISBSG equations includes all effort across
all phases of the life cycle from project initiation to project completion for software developers, project managers, and project administration
The following results using the equations that utilize software size and maximum team size offer an interesting comparison Because only those equations are presented in which size and team size both have a significant impact, the set of platform and language combinations excludes some that occurred in the equivalent set based upon software size alone, in the previous example
Estimated Effort for 500 FP Project with a Max Team Size of 5 2,475 person hours 2,175 person hours 2,263 person hours 3,293 person hours 2,941 person hours
Platform and Effort Equation Utilizing Software Language Size and Maximum Team Size MR & 3GL MR & 4GL PC & 3GL Multi & 3GL Multi & 4GL Effort = 4294*FPSize0395*MxTeam0994 Effort = 5686*FPSize Effort = 2866*FPSize Effort = 935*FPSize
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