The empirical rational of case-based decision theory(CBDT) is analyzed and a
case-based decision method which can be used in innovative design is
proposed. Firstly, the intrinsic motivation of preference reversing is
analyzed and the potential impact to decision results of cases in CBDT is
indicated. Then a method of differentiating the irrespective cases and the
heuristic cases is proposed with the case-based decision method based on
threshold. Finally, through the application example of motorcycle engine
innovative design, the decision-making steps of the method are illustrated.
The method has better utility value and practical effect than case-based reasoning(CBR) method.