The metric model of software trustworthiness based on symbiosis theory

Nowadays, as more and more software are used in daily, a large number of many software defects are revealed, and conventional measurement method of software trustworthiness can not reflect the impact of mutual restrain between the various properties of software trustworthiness on software trustworthiness measuring, in order to solve this problem, a tolerance switching function is used in this paper. By introduced symbiosis theory, analyzed the vine network characteristics between the various properties of software trustworthiness, proposed necessary and sufficient conditions for software trustworthiness measuring, and given a formal proof, on the basis, proposed a tolerance switching function and software trustworthiness inclusion-symbiosis model(STISM). It is more reasonable use of this metric model with tolerance switching function because it better reflects the impact of mutual restrain between the various properties of software trustworthiness on it. It puts forward a solution for the lacking of system integrity of traditional measurement of software trustworthiness.