This document discusses how to document business model hypotheses using a business model canvas. It explains that the canvas has nine blocks that describe key aspects of a business model: problems being solved, solutions provided, unique value proposition, unfair advantage, customer segments, key activities, channels, cost structure, and revenue streams. The document provides examples of filling out each block with increasingly specific details about problems, features, target customers, and costs and revenues. Documenting business model hypotheses in this way allows entrepreneurs to test and validate their assumptions about the problem, solution, customer needs, and viability of the business model.