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Designing tasks in case-based reasoning requires the use of case adaptation due to its novelty characteristic. In this paper, constraint satisfaction is used to generate potential solutions for design case adaptation. An ontological approach is proposed to perform the inference process to satisfy the multiple design constraints. Domain application is the dietary menu planning for diabetics. Results show that the dietary menu planning designed by the proposed approach is better than the conventional approach. Both the physical and aesthetic constraints were satisfied by the proposed approach.