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The issue in conceptual design theory is to understand the processes which lead to innovation and to create tools which generate step changes in function in an orderly and repetitious manner. Detailed form-function synthesis methods which generally follow the conceptual phase of the design process require input specifications. An extension of function logic is proposed as a means to systematically promote innovation, manage conceptual design information, and produce such specifications. Applications of the model are given to include design intent, information flow, functional variants, and system behaviour.