Dynamic software testing and evaluation are important software engineering subjects and can be used to improve reliability. In this paper, we propose a dynamic software testing and evaluation model based on the state space method. In this model, the run time features of software are quantified into one state vector; the program scale, difficulties, structures, and development expenses are quantified into one input vector; the total software complexity is quantified into one output vector; and the software testing and evaluation process is regarded as a feedback control process. Dynamic software testing and evaluation with the state space method can adaptively regulate the critical factors that drastically affect software reliability. Experimental results show that the proposed method is useful for reducing costs, shortening developing time, and improving reliability.
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