This summary describes the more significant activities and achievements of the Defense Documentation Center (DDC) including: DDC and the scientific and technical community. The DDC role in the Department of Defense Scientific and Technical Information Program continued to shift from the traditional concept of an archival repository and a library-oriented operation to the development and execution of computer-based information systems. The services offered scientific and technical information (S and TI) users continued to expand from the furnishing of hard copy documents to a full range of products tailored to the users' needs. Increased emphasis was placed on the DDC development mission and related programs. The basic objective of the program is to provide major advances in terms of new and significantly improved S and TI products and services, and the identification and removal of barriers to S and TI transfer. Development plans include efforts to identify and develop S and TI products, services, and systems for future as well as present needs. Conversion to the UNIVAC 1108 computer system. DDC production and development effort was affected by conversion from the UNIVAC 1107 to the UNIVAC 1108 computer system. Increased processing capacity of the 1108 system was reflected in expanded DDC mission and service capabilities in most areas. (Author)