guide your own thinking in strategy work, you must cultivate three essential skills or habits. First, you must have a variety of tools for fighting your own myopia and for guiding your own attention. Second, you must develop the ability to question your own judgment. If your reasoning cannot withstand a vigorous attack, your strategy cannot be expected to stand in the face of real competition. Third, you must cultivate the habit of making and recording judgments so that you can improve.
