Last day at LEAP 2008 in Redmond I first enjoyed breakfirst and then went to workshop Software Factories done by Jack Greenfield. He is author of the book Software Factories. The workshop goes into the theory of Software Factories. If you are new to this subject or do not exactly where to start I suggest you go to Edward Bakker blog site. He recently did a post about where to start with Software Factories. So go check it out.