LePUS3, the language of Codecharts, has proven to radically cut the costs of key tasks in software development and significantly improves the quality of software produced. This classroom-tested resource teaches this visual language through extensive examples and case studies, offering more precise and elegant notation than any other text on the market. It provides accessible, illustration-driven content, with blueprints and roadmaps of programs appearing on almost every page. The book is written for software professionals, third- and fourth-year students of computer science, and graduate students and researchers in software engineering.