Evaluation of reliability of enterprise content manage-ment system Directum by analysis of operation results

Modern reliability theory widely uses quantitative indicators. Those indicators together with other efficiency indexes are applied during system design processes. They provide to choose optimal or compromise design solutions under taking into account their reliability. During software development that defines system concept level a number of methods for its verification are used. These methods are focused on reliability improvement. However on practice, estimation of achieved reliability is not performed. This work is concerned with estimation of software reliability indicators by analysis of results of appeared error statistical processing for enterprise content management system Directum updated according to customer requirements. We propose two complementary models of error appearing: discrete and continues under computing of Jelinski-Moranda parameters by the least square method. Reliability indicators been achieved because of Directum system debugging were evaluated and may be refined during its operation. Presented results provide prediction of Directum system reliability indicator variations.