The document discusses the Customer Development methodology for startups. It introduces the concept of focusing on customer development from the beginning, rather than solely focusing on product development. The Customer Development process involves 4 steps: Customer Discovery, Customer Validation, Customer Creation, and Company Building. Each step has criteria for completion that focus on validating customer problems and market fit before advancing to the next stage of development and execution. The methodology aims to reduce risks for startups by prioritizing learning about customers and markets over prematurely executing on an untested business hypothesis.