This paper proposes an approach for reusing design methods from past designs for solving new problems. This is an application of case-based reasoning to design. The proposed approach is implemented as a prototype system called CADREM. CADREM has been tried in the domain of conceptual structural design of buildings. First, a description of case-based reasoning is given followed by its application in design. Then follows a description of the proposed approach and CADREM. Sample outputs from CADREM are also included.