关键词: 网构软件, 服务更新, 可靠性模型, 开放环境

Abstract: Internetware is an abstract of software system basic paradigm under an open， dynamic and ever-changing Internet environment. This new software system is architected on an effective collaboration of heterogeneous and autonomous software service entities under an open environment. Its reliability depends not only on autonomous software entity itself， but also on dynamic changes of outside， such as changes of service entity elements under an open environment. The current reliability measurement model for traditional software is no longer suitable for this new software paradigm. It becomes a more urgent issue whether a good reliability measurement model can be built under internetware software paradigm. A concept of failure counts during service update process is brought forward. Service update intensity is applied into Musa-Okumoto model， which is one of the most widely used software reliability models， therefore this model is expanded under new software paradigm. Finally internetware deterioration and its condition are also discussed.

Key words: internetware, service update, reliability model, open environment