This concise guide introduces and thoroughly illuminates the concept of living documentation that changes at the same pace as software design and development, from establishment of business goals to capturing domain knowledge, creating architecture, designing software, coding, and deployment. Replete with clarifying illustrations and concrete examples, it shows how to dramatically improve your documentation at minimal extra cost by using well-crafted artifacts and judicious automation. Language- and technology-agnostic. borrows powerful ideas from domain-driven design, helping you customize its concepts and apply its lessons to meet your changing documentation needs in your own specific domain. Cyrille Martraire proves that you don’t have to choose between working software and comprehensive, high-quality documentation: you can have the benefits of both.