This expanded second edition of the Compendium provides updated information on sanitation systems and an increased range of technologies in one volume. It will be an important resource for stakeholders in their decision making planning process. Part 1 describes different system configurations for a variety of contexts.Part 2 consists of 57 different technology information sheets, which describe the main advantages, disadvantages, applications and the appropriateness of the technologies required to build a comprehensive sanitation system. Each technology information sheet is complemented by a descriptive illustration.