The final talk of the day was a presentation by Bill Lorensen on the development process used in vtk. It is a fairly complex system (492 classes, 2000 instance variables, 8000 member functions, 64,000 statements, 220,000 lines of code). I was impressed by the amount of automated testing they put into this system. Basically, there is a build done every night which includes automated regression testing. The results of the build are posted to http://vtk.scorec.rpi.edu/Nightly/MostRecentResults. The nightly build source code is available as is a stable release version. Although most of the development work is done at GE CRD, users are encouraged to submit code for inclusion in the vtk baseline. Kitware is a commercial spin-off of GE CRD whose main service is providing commercial support for vtk.