This is the first in a series of reports describing the origin, development, and applications of the Naval Enlisted Professional Development Information System (NEPDIS). The NEPDIS was designed to be a fully computerized information assembly and analysis system that would eventually support manpower, personnel, and training management. This report provides an overview of the NEPDIS. It describes NEPDIS subsystems, summarizes the current status of the system and ongoing developments, and treats a projected application of the NEPDIS concept to a model for Navy enlisted career planning. The NEPDIS system includes an occupational data base and a computer-assisted method to perform the job/task/skill analysis. It is composed of five major subsystems which include seven files. These subsystems and files include the Training Development Subsystem (Training Development and Management File, Task Inventory File); the Instructional Subsystem (Instructional Program File, Training Materials and Literature File); the Training Record and Evaluation Subsystem (Training and Education File, Training Evaluation File); the Career Development Subsystem (Career Ladder File); and the Audit Subsystem. Of these subsystems and files, only the Task Inventory File is fully operational, while the remaining subsystems are at various stages of conceptual or computer software development. (Author/KC)