To create innovative ideas, it is important for designers to monitor thought patterns by reflecting upon their thought structure, and then control thought. In this study, we presented a framework for deduction, induction and abduction by applying a design process that is actually used by product designers; and, taking the example of a specific product-development process, showed that a certain pattern, combining abduction and induction, exists when a shape is created. This pattern illustrates what we call an “analogy-based approach'.” We evaluated the usefulness of the method by actually carrying out the molding process adopting this inference pattern.