This volume constitutes the refereed revised proceedings of the First United Kingdom Workshop on Case-Based Reasoning, held in Salford, UK in January 1995. The 16 revised papers presented are organized in theoretical and application papers; in addition, there is a comprehensive introduction to the volume and case-based reasoning in general by the volume editor. Among the topics addressed are case-based design, case memories, concept learning, retrieval, decision making, and case-based planning. The volume is of interest to researchers in the area and to professionals applying case-based reasoning techniques.