A dash of insight discusses the fact that you need to have a system to get you in and out of the market. And in his post he actually has a summary of his system. Most critically, ignoring the noise around you and focusing on your system allows you to make better decisions.
He used his system to show what the markets looked like in March of 2009 as compared to March 2011. Here is a highlighted table:
Borrowing methodology from the stock market is not new. Do you have a system for your sales and operations in your business? Does it tell you when you should double down and more importantly when you should cut?