If you force yourself to classify mistakes you make, you will learn that there are only a few classes of mistakes and that you make the same type of mistakes repeatedly. My mistakes can all be classified as mistakes caused by intolerance, intemperance, impatience or being too optimistic. Because I know this about myself, I have gotten better over the years in reducing the number and impact of the mistakes I am prone to make and tried to surround myself with more cautious, more temperate individuals. Knowing the type of mistakes you make is important because that knowledge can be used as you build the team around you. You can construct a team with different strengths and weaknesses who complement your strengths and balance your proclivities with regard to the type of mistake you make. It is equally important to understand the classes of mistakes your team members are prone to make.