The document provides guidance on writing an effective questionnaire to collect feedback on prototypes and ideas. It recommends including open questions, questions framed to encourage constructive feedback and building on the idea, and organizing the questionnaire to start with general impressions, ask for specific feedback, and then open up broader discussion. An effective questionnaire structure the feedback conversation and allows for comparing opinions while exploring new areas. It should be organized with an eye towards timing and in a readable format to guide the conversation.