An Experiment Measuring the E ects of Personal Software Process ( PSP ) Training

The Personal Software Process is a process improvement methodology aiming at individual software engineers. It claims to improve software quality (in particular defect content), effort estimation capability, and process adaptation and improvement capabilities. We have tested some of these claims in an experiment comparing the performance of participants who had just previously received a PSP course to a di erent group of participants who had received other technical training instead. Each participant of both groups performed the same task. We found the following positive e ects: The PSP group estimated their productivity (though not their e ort) more accurately, made fewer trivial mistakes, and their programs performed more careful error-checking; further, the performance variability was smaller in the PSP group in various respects. However, the improvements are smaller than the PSP proponents usually assume, possibly due to the low actual usage of PSP techniques in the PSP group. We conjecture that PSP training alone does not automatically realize the PSP's potential bene ts (as seen in some industrial PSP success stories) when programmers are left alone with motivating themselves to actually use the PSP techniques.