摘要：This paper presents software metrics concepts for Open Source products. Open Source software is presented. Quality requirements are assessed. Software metrics are presented, with accent on reliability. Refinement techniques for estimation models are described. Refinement techniques include classic methods and modern methods. Model generators are described. Modelbase as a software product is described. Open Source products are assessed in terms of reliability. The reliability of Apache HTTP Server is estimated using model refinement techniques. Data is collected using publicly available sources and refinement methods are applied to obtain estimation models. Results are interpreted.
关键词：open source; software metrics; quality; model refinement
