Someone hands you sixty pages and you have an hour, so you ask the obvious question and get a fluent answer that reads exactly the same whether or not it covered the section you care about. A summary is a claim you cannot check. A map is one you can: open the contents page and count. 17 prompts for making a long document hand back its own shape before you ask it anything, built on one line that keeps a map from collapsing into a summary. Ask what each section does, not what it says.