The key lesson from these investors is that we must concentrate on process. Process is the set of rules that govern how we go about investing. As we have seen time and time again in this Little Book, some of the worlds greatest investors (from Sir John Templeton ’s research on a quiet day to George Soros’s diaries, from Bruce Berkowitz’s kill the company to Michael Steinhardt’s selling the entire portfolio) have integrated measures into the way in which they approach investment to act as a guard against mindless investing.