Land Tenure Service (SDAA) of the Rural Development Division embarked on the preparation of a land tenure "Thesaurus", mainly covering the following sectors: legal, institutional, historical, description of space, traditional or written land tenure regulations, topographical, land management, as well as land tenure related information techniques. It is expected that the Thesaurus will serve as reference material both for the normative divisions at FAO Headquarters as well as for field experts engaged in the implementation of projects with a land tenure component. It could also be useful for training in subject matters related to natural resources and their management, as well as for researchers in the field.