The European Commission, DG XIII, has published the COST (European Cooperation in the Field of Scientific and Technical Research) general activity report for 1993-1994. The report was drawn up by the COST section of DG XII, in collaboration with other Commission departments involved in COST actions (mainly DG VII "Transport" and DG XIII "Telecommunications, information market and exploitation of research". It gives an activity report on the actions of the various COST technical committees in the following sectors: - Informatics (one ongoing action); - Telecommunications (28 ongoing actions); - Transport (14 ongoing actions); - Oceanography (one ongoing action); - Materials (14 ongoing actions); - Environment (ten ongoing actions); - Meteorology (eight ongoing actions); - Agriculture and biotechnology (17 ongoing actions); - Food technology (18 ongoing actions); - Social sciences (six ongoing actions); - Medical research (six ongoing actions); - Civil engineering (four ongoing actions); - Chemistry (seven ongoing actions); - Forestry (three ongoing actions); - Fluid dynamics (one ongoing actions); - Physics (ad-hoc working party on technology driven physics); - Miscellaneous (one project on the application of ion beam analysis and applications to art and archaeological objects). The total number of COST actions rose from 70 at the end or 1992 to 115 at the end of 1994, in line with the interest in new research areas. Total participation by the 25 countries (the 15 EU Member States, Iceland, Norway, Switzerland, the Czech Republic, Slovakia, Hungary, Poland, Turkey, Slovenia and Croatia) doubled from 740 to 1,467 during the same period.