Scientific style of speech: technical profile. The book is a unique system of tasks in Russian worked out on the basis of the main high school course for mathematicians, physicists and chemists. The aim of the course is to introduce and promote language material in the oral and written forms and to develop skills of reading and those of dialogues and monologues. This 4th revised edition is designed for the students of the technical and natural science profiles with the basic level of Russian. It is composed of two parts: the introduction and the main part. Introduction includes a limited list of lexical units to be introduced and trained on the basis of various grammar tasks and tests closely connected with the rules of pronunciation for mathematicians, physicists and chemists. The aim of the main part is to develop skills acquired in the introduction. The main part includes several topics. Each topic has three parts: grammar and conversation, writing, reading. The structure of the book may be of interest not only for students, but also for their teachers.