I just finished a two-year project looking at Michael Porter’s most important insights for managers. Connecting the dots between his classic frameworks (the five forces, for example) and his latest thinking (the five tests of strategy) gave me a new understanding of the most common mistakes that can derail a company’s strategy. In a previous post, I focused on the fallacy of competing to be the best. Here are five more traps I’ve seen managers fall into over and over again. Understanding Porter’s strategy fundamentals will help you to avoid them.