Every Problem Has a Solution: Your Guide to Creative Problem Solving

Argues that the feeling of a dead end is wrong at least as often as it is right, because either the problem has not actually been understood or the assumptions defining it are silently excluding every workable option. Creative problem solving is not inspiration, it's a procedure: change what the problem is, then search for solutions.

Gives the procedure: write a one-sentence problem statement and list the entities involved, audit your assumptions against your real constraints, solve top-down in deliberately general parts, and hold a candidate through two opposing passes in the same sitting. Includes the mistake of solving the stated problem instead of the actual one.