Using Your Head: To use strategy well you must: 1) fight your own narrow (myopic) thinking; 2) question your own judgment; and 3) make and record your judgments. To help these three activities, Rumelt again discusses using the kernel (diagnosis, an overall guiding philosophy, and taking coherent action). He also mentions problem solving as a way of attacking or diagnosing the problem. Next, he offers “create and destroy” as a critical thinking technique. Developing a strong counter to your own strategy—whether a real panel of devil’s advocates or ones in your head—will help vet ideas that can stand up to challenge. Finally, good judgment comes from self knowledge and knowing others, as well as anticipating and testing your own thoughts. Taking a stand, defending, and then modifying your position are important skills for all leaders to learn.