Six Thinking Hats, by Edward DeBono. The concept is very simple, but this idea of looking at something from different defined perspectives is a useful tool that

Six Thinking Hats, by Edward DeBono. The concept is very simple, but this idea of looking at something from different defined perspectives is a useful tool that many seem to lack. Getting to Yes. Still one of the best books on negotiating. Again, the simple concept of seeing the world from the other side of the negotiating table, IE: thinking like the competition. The Little Blue Book. A must read for people working in progressive politics. Will help you to think like the other side so you can formulate messaging they will understand. A computer science degree (and thus any materials on CS), if done well, can be an exercise in thinking / problem solving skill that can serve well beyond traditional STEM careers.