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Wednesday, November 5 • 10:35am - 11:15am
An Extension of the PSP PROBE Process to Help Students Make More Reliable Estimates in Early Stages of PSP Training

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Students experience significant over- or underestimates in new program development when it follows the Personal Software Process (PSP) PROBE process. This presentation overviews how this potential problem can be reduced or solved by extending the PSP PROBE process.

A strategy is to find a logical evaluation combination of the productivity, correlation, and β1 and β0 used in the PROBE process. The estimated average size and time for a new program to be developed are obtained when method C is selected. The estimated proxy size is obtained for the new program through the PSP relative size table applied to the conceptual design. The estimated average size replaces the estimated proxy size when a student selects method C. If the estimated average size is not reasonably consistent with the past productivity data, the student should select method D for the size estimate. The similar discussion holds for the time estimate.

Another extension that is effective in the PSP PROBE process is to allow selecting method A or B when high correlations are recognized between the estimate and actual values, regardless of whether β0 or β1 satisfies the desired conditions respectively described in the PSP PROBE process, although the PROBE process suggests selecting method C for these cases.

After this extended PROBE process was presented, PSP students demonstrated reaching fewer over- or underestimates on the size and time of new programs.

avatar for Yoshihiro Akiyama

Yoshihiro Akiyama

Next Process Institute, Ltd.
Yoshihiro Akiyama is a Carnegie Mellon Software Engineering Institute (SEI) Affiliate; founder and CEO of Next Process Institute, Ltd.; and Visiting Professor at Kyushu Institute of Technology. He provides PSP Instructor and TSP Coach Training as an SEI TSP Strategic Partner for software... Read More →

Wednesday November 5, 2014 10:35am - 11:15am EST
Grand Station Ballroom 3

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