Scientific and technical contacts between nations· have necessitated the publication of various language textbooks, manuals and reference books. Particularly important among them are multilingual scientifio and technical dictionaries. This English-German-French-Dutch-Russian Dictionary of Scientifio and Technical Terms contains some 9000 entries. The main fea ture of the Dictionary is that it includes first and foremost general scientific terms needed by an engineer working in any branch of science and technology. Besides, the Dictionary includes the basic terms used in physics, mathemat ics, the fundamentals of electrical engineering and chemistry, and also the most essential terms pertaining to manufacturing processes. machine design, testing methods, etc. The Compilers were confronted with a difficult task, as nowadays science and technology are developing rapidly and the minimum scientific and tech nical vocabulary required by a specialist is increasing accordingly. The Compilers have taken special pains to include the entire basic mod ern technical vocabulary, omitting superfluous words and phrases. They have tried to solve this problem by selecting mainly those scientific and tech nical terms which constitute the basic of a specialised vocabulary. There fore, the Dictionary includes the vocabulary pertaining to general study courses in mathematics, physics and chemistry, and also in electrical engi neering. electronics and machine design, given in technical colleges irrespect ive of their specification. This lends the Dictionary an «all-purpose» char acter, making it equally useful to scientists and engineers of different countries, who have graduated from colleges with different curricula.