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Heuristic A method of solving a problem which proceeds by trial and error. Used in Usability Engineering to define problems to be attempted by the end-user. HCI Human Computer Interaction – the study of the human computer interface and how to make computers more “user friendly”. 42 Incremental The implementation of a system in a piece-by-piece fashion. Differs from a big-bang approach in that implementation is in parts allowing a transition from old to new. Kernel The part of software product that does the internal processing.

This may seem trivial but in a large development environment it can be quite tricky. Take for example a system where ten developers are working in parallel on a piece of code. When you go to build and release a version of the system how do you know what changes have been checked in ? When you release multiple versions of the same system to multiple customers and they start reporting bugs six months later, how do you know which version the error occurs in ? How do you know which version to upgrade them to, to resolve the issue?

Once you have this data you can quantify the proportion of defects attributable to each cause. Classification Requirements Count 12 % 21% In this table, 32% of defects are attributable to mistakes by the test team, a huge proportion. Design Error 5 9% Code Error 9 16% Test Error 18 32% Configuration 9 16% While there are obviously issues with requirements, coding and configuration, the large number of test errors means there are major issues with the accuracy of testing. Existing bug 3 5% 56 100% TOTAL Figure 14: Sample root cause analysis While most of these defects will be rejected and closed, a substantial amount of time will be spent diagnosing and debating them.

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