[en] Since 1977 Swedish Nuclear Fuel and Waste Managements Co., SKB has been performing a research and development program for the final disposal of spent nuclear fuel. One aim of this program is to gain knowledge of different bedrock properties. Measurements for the characterization of geological, geophysical, hydrogeological and hydrochemical conditions are performed in specific site investigations as well as for geoscientific projects. Large volumes of data have been produced since the start of the program, in the form of both raw data and results. During (the course of) the research program this data has been stored in various formats by different institutions and companies performing the investigations. It was therefore decided that all data from the research and development program should be stored in a single database. The database, called Geotab, is a relational database, based on a database handling system from Mimer Information Systems. The application program, also called GEOTAB, was developed by Ergodata. This manual provides a description of the basics of the database and application programs used in connection with GEOTAB. It is intended as an introduction for new and regular users. The database is a mix of information organized so that storage, retrieval and modification of the data is as efficient as possible. GEOTAB is built around a relational database model. (au)