Godfrey E. Drexel and Don R. Haris, Basic Elements of Intelligence, Department of Justice, Washington, 1971

found in Principles of Investigation, John P. Kenney and Harry W. More, Jr., West Publishing, 1979


A schematic of the Intelligence Gathering Process is shown [at right]. This type of information may be used in all types of investigations. Of course, the investigation should always follow the detailed procedures outlined in his [sic] departmental manuals.