An important element of geotechnical calculations are parameters for the quantification of the mechanical and hydraulic properties of soil and rock. To establish the ground properties it is not only necessary to perform field and laboratory tests for the actual site but also to take into account experience gathered with similar projects and ground conditions. This is also stressed in Eurocode 7 Geotechnical design in which the term “comparable experience” has particular significance and in which it is stated that “the selection of characteristic values for geotechnical parameters shall be based on results and derived values from laboratory and field tests, complemented by well-established experience”. Therefore a database for the results of laboratory tests is a useful and highly necessary tool. This paper gives an overview of a concept for a database of common mechanical data for soil and rock. The aim of the proposed concept is the standardization of the database and the consideration of all important information so that the data can be used for a variety of purposes. The most important feature of the database is the introduction of reliability classes which will enable future users to assess the data objectively.