Obvious inconsistencies are always appeared in applying software reliability model. So it has become a very important field to choose the good-adaptability model from the existing models. This paper describes the unascertained-based software reliability model selection, and at this basis, an automated tool for selecting reliability model, SRMSS, is proposed. After the basic design method of the tool is given, an example is given to describe the specific application of the SRMSS.

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