A product of the International Information Center for Terminology (Infoterm), this manual is designed to serve as a reference tool for practitioners active in terminology work and documentation. The manual explores the basic ideas of the Vienna School of Terminology and explains developments in the area of applied computer aided terminography within the last few years. The manual consists of seven sections: (1) an overview of world-wide terminological activities and the objectives of TermNet (the International Network of Terminology); (2) the General Theory of Terminology as related to other academic disciplines; (3) terminological principles; (4) methods of terminology; (5) a general idea of how to carry out terminology projects; (6) a concise presentation of the fundamentals of terminology documentation for the purpose of TermNet; and (7) a multi-language bibliography of the basic literature. Reference lists are included in several sections. (THC)