The document introduces the Lean Startup methodology (LSM), which is an approach for launching products and services based on Japanese lean manufacturing principles. The LSM relies on validated learning, experimentation, and iterative product releases to shorten product development cycles, constantly measure progress, and gain valuable customer feedback. It outlines the Build-Measure-Learn process which involves creating a hypothesis, building a minimum viable product, measuring customer responses, analyzing the data to learn what works and what doesn't, and then deciding whether to pivot the product or persevere with the existing hypothesis before repeating the process.