This guide presents the TODOS methodology and design support environment for office information systems development. In TODOS, a method for the definition of an office system is proposed, and tools support the developer in different design phases, in order to analyze results and to present them to final users of the office systems. The main goal of the TODOS approach is to avoid the unnecessary re-implementation of hardware and software components available on the market. The book is mainly oriented towards professionals looking for a method for office system development. It may also be of benefit to office system managers interested in exploring the possibilities of office information system development within their organizations.