The general process of human's solving complex problem and the incompleteness of qualitative knowledge and quantitative knowledge when being used in solving complex problem are analyzed. Then a meta-synthesis approach and its framework to model the complex problem solving are put forward. According to this approach, the modeling process is divided into three phrases, which are the construction of problem structure model, the construction of problem relation description model and the construction of problem solving model. The qualitative knowledge, which includes the domain knowledge and the problem knowledge, and the quantitative knowledge, which includes the model knowledge, the method knowledge and the tool or operator knowledge, are used synthetically to support these three modeling phrases. In the end of the paper, an example is given to prove the scientificity and the feasibility of this approach.
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