On most of the projects, there was good conformity between the trend model
and the reported error data. More importantly, estimates of the total number of
errors and the error discovery parameter, made fairly early in the testing
activity, seemed to provide reliable indicators of the total number of errors
actually found and the time it took to find future errors.
Figures 2 shows the
relationship between reported errors and the SATC trend model for one project.
The graph represents data available at the conclusion of the project. This close
fit was also found on other projects when sufficient data was available.
Figure 2: Cumulative Software Errors for Project A
