The Comparison of Software Reliability Assessment Models

The reliability of the software represents one of the most important attributes of software quality, and the estimation of the reliability of the software is a problem hard to solve with accuracy. Nevertheless, in order to manage the quality of the software and of the standard practices in an organization, it is important to achieve an estimation of the reliability as accurate as possible. In the present work there are described the principles and techniques which underlie the estimation of the reliability of the software, starting from the definition of the concepts which express the attributes of software quality. It is taken into account the issue of the estimation of a software part. The presumed objective of the estimation of the reliability consists in the analysis of the risk and of the reliability of the software-based systems. Supposedly, a documented opinion of the expert exists regarding the reliability of the software and an update of the defined estimation of the reliability is tried with the information contained in the records of the operational data.