The present guide for the IT-Grundschutz Methodology "Basic Protection” provides a compact and clearly structured introduction to the development of an information security management system (ISMS) in an organisation. An ISMS is a planned and organised course of action to achieveand maintain an appropriate level of information security. The guide is based on BSI Standard 200-2 regarding the IT-Grundschutz Methodology and explains elementary steps for reviewing and increasing the information security level.