The document discusses intelligence planning and problem framing. It uses the metaphor of a puzzle to illustrate different types of intelligence problems - from simple problems with discernible clues, to complex "mysteries" with millions of unknown variables. For simple problems, the key is finding the missing puzzle pieces and fitting them together. For mysteries, the sea of unknown information can be overwhelming, so the analyst must set boundaries and not get paralyzed in information overload. The document advocates understanding the nature and complexity of the intelligence problem during the planning phase.