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Friday, May 30, 2008

Testing Stop Process - V


On another project, different estimates of the total number of errors were obtained when estimates were made over different testing time intervals. That is, there was inconsistent agreement between the trend model and the error data over different time intervals. Through subsequent discussion with the project manager it was learned that the rate of error reporting by the project went from approximately 100% during integration testing to 40% during acceptance testing. Furthermore, there was a significant amount of code rework, and testing of the software involved a sequential strategy of completely testing a single functional area before proceeding to test the next functional area of the code. Thus, the instability of the estimates of the total errors was a useful indicator of the fact that there was a significant change in either the project's testing and reporting process. Figure 3 shows the results for this project. Note the change in slope of the reported number of errors occurring around 150 days. The data curve flattens at the right end of the curve due to a pause in testing, rather than a lack of error detection. This project is still undergoing testing.


Figure 3: Cumulative S/W Errors for Project B - Flight S/W

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