Where are the cliff notes for management?
You've heard people quote this strategy, method, or theory - Porter's Five Forces, BCG Matrix, Balanced Scorecards, etc. -- and want to know what the hell they're talking about.
For an excellent summary of hundreds of approaches to management the 12Manage site provides 1 page summaries organized in a spectrum of categories. Well worth a visit.
So the next time a consultant or job applicant spouts off "I'm a proponent of using Ohmae's 3C's Model tempered by Kapferer's Brand Identity Prism to develop a profitable CRM strategy" -- you can call their bluff.