the 80/20 talk has some of the ideas i want: http://www.youtube.com/watch?v=zXRxsRgLRZ4 it mentions bug cluseters- an effect endorsed by katerina he mentions sweet spots, not limits to congitive task but nothing about stochastic sampling. and nothing about how simple data mining can help eye on the prize. build the test engine first. not just unit tests but a special kind of system tests called CSMs