The analysis and modeling for the input space of real-time embedded software

Software reliability testing is one of the important tasks in software reliability engineering, in which the failure data can be used to evaluate and validate the software reliability. In this paper, the input space of real-time embedded software is analyzed first. And the model of input space constructed with usage space and input value space is presented, with which a formal modeling method, the usage profile in network graph form, is presented. With the usage profile, the constraint conditions of operations and the dynamic actions of software users can be expressed closely to actual situation. The software reliability testing cases can be generated with random sampling according to the software usage profile.