This widely used text, of which 30,000 copies in the second edition alone have been sold, is now presented in its third edition. Designed as a basic introductory text for courses in social research methods, surveys, and statistical field studies, it has also proved useful for courses in social work, public administration, and government research. Beginning with a historical background section that traces the development of social surveys and research, the book goes on to cover in simple terms the basic principles underlying scientific procedure. It discusses the sources of information, the means of testing their reliability, and the various methods of procuring information. It describes concretely the use of such indispensable tools and methods as techniques of field observation, techniques of constructing and using schedules and questionnaires, methods of interviewing, the case study method, statistical concepts and techniques, and graphic presentation. In short, it is distinguished by its practical, comprehensive treatment of research methods, which it bases upon logical principles and illustrates with actual field studies. The third edition, which constitutes an extensive revision, features new insights, illustrations, materials, and bibliographies, all of which augment the value of this outstandingly successful text. The four chapters and the maps by Calvin Schmid have been thoroughly revised and brought up to date.