This paper discusses the necessity for scientific and technical personnel to maintain personal files and the limitations of centralized information services in meeting the diverse and changing information access requirements of these personnel. A prototype service is described that uses a computer to aid individuals organize, maintain and find what is in their files by means of personalized, printed indexes. Through building a machine-readable record of user indexing practice, the service furnishes a means of identifying current user information requirements and for improved feedback of these requirements to centralized services. (Author)