This training manual is intended as an individual study aid for Navy personnel who wish to prepare for advancement to the rate of Data Processing Technician First Class or Chief Data Processing Technician. Theoretical knowledge and operational skills are presented along with assignments designed to lead students through the manual. The manual first describes general computer documentation and the use of COBOL in data processing. COBOL in the data division and the procedure division is described and documented with examples. The kinds of systems used by the Navy are explained. Personnel organization and duties for Navy data processing technicians are detailed followed by an analysis of appropriate supervisory personnel requirements, procedures, and attitudes. (CH)