The book examines the development of theoretical ideas about the system of scientific principles of forensic methodology and the general method of investigating crimes as an integral concept of this system, defines the concept of planning in a criminal case and the place of particular forensic techniques in the structure of this method. The principles of development and construction of private investigative methods and the basis for their systematization are substantiated. For students of law universities and faculties, graduate students and doctoral students, researchers and legal teachers, practical workers of law enforcement agencies, the bar and the court.