On-line retrieval system design is discussed in the two papers which make up Part Five of this report on Salton's Magical Automatic Retriever of Texts (SMART) project report. The first paper: "A Prototype On-Line Document Retrieval System" by D. Williamson and R. Williamson outlines a design for a SMART on-line document retrieval system using console initiated search and retrieval procedures. The conversational system is described as well as the program organization. The second paper: "Template Analysis in a Conversational System" by S. F. Weiss discusses natural language conversational systems. The use of natural language makes possible the implementation of a natural dialogue system, and renders the system available to a wide range of users. A set of goals for such a system is presented. An experimental conversational system is implemented using a template analysis process. A detailed discussion of both user and system performance is presented. (For the entire SMART project report see LI 002 719 and for parts 1-4 see LI 002 720 through LI 002 723.) (NH)