The document introduces the Business Model Canvas as a visual tool for developing a business model. It breaks down the key elements of a business model - including customer segments, value propositions, distribution channels, customer relationships, revenue streams, key resources, key activities, key partnerships, and cost structure. For each element, it provides guidance on important questions to consider when defining that part of the business model. It stresses that the canvas allows viewing relationships between elements and serves as a tool for identifying assumptions to test through validation.