Get Involved/Quality/Beta/4.9Applications
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Beta Testing KDE applications for 4.9
Umbrello
See Umbrello description: http://en.wikipedia.org/wiki/Umbrello_UML_Modeller
It has a checklist ready which can be used for other applications
http://websvn.kde.org/trunk/KDE/kdesdk/umbrello/test/ATP.txt?revision=1244714&view=markup
Save this checklist and fill it, reporting bugs as you find them. Send the checklist to the maintainer.