The document outlines how to use the survey tool survey.io to measure product/market fit. It recommends asking customers questions about how they discovered the product, how they would feel without it, what alternative they would use, the primary benefit, if they have recommended it, what type of person could benefit most, how to improve it, and if follow up is okay. It also discusses getting qualitative feedback before fit is achieved and identifying must-have features by industry by asking the must-have question.