The Bainees had a remarkable methodolgy.  They had access to top management than any middle manager would die for - even "consultants" barely out of college.  They did powerpoint presentations but never allowed anyone have a hard copy.  They were brilliant at re-utilissing the same few concepts in every context, and their main goal was to hoover up as much local business knowledge as they could and then recycle it as part of their business transformation plans.  They operated largely in pairs, like Mormon missionaries.  They identified huge savings to justify their costs - but the savings always had to be implemented and achieved by someone else, of course.  

This is quite a few years ago now.  No doubt their methods have evolved.

notes from no w here