note htoug That was the preferred way of doing things when I started - way back in the early '70ies.<p> Things have progressed since then!<p> The recommended way is now a variant of <em>Test early, test often</em> mixed with <em>Iterate</em> - either XP, Agile or perhaps some form of RUP (for the BSDM fans) or whatever the current name is.<p> Nowadays you prototype, testing as you go along, releasing incrementally and refactoring when needed, all in an iterative way. All this requires a strong test-suite, which is buld preferebly before development. Testing is a lifelong process, and the testsuite keeps growing - often it is larger than the application - but it keeps everyone happy, as we all know that the system is working as expected. 290885 290940