Interview the user to a settled design, one round at a time. Use to stress-test a plan, decision, or architecture ("grill me", "poke holes in this"), and equally when an idea is still vague and the requirements are unstated ("what if we built", "how should this work"). Works a design tree: asks the whole answerable frontier each round with a recommendation per question, finds its own facts, and lands the result as a design before anything gets built.
