ABSTRACT
The method of earned value management is applied to the actual software projects under various IT companies. Also, much open source software (OSS) is developed and managed by using fault big data recorded on bug tracking systems. At present, OSS is used in various application areas, because OSS is useful for many users to make cost reductions, standardization, and quick delivery. The methods for reliability assessment of OSS have been proposed by several researchers. The chapter discusses the OSS effort estimation model by using the conventional stochastic differential equation model. It describes a useful method of OSS project management based on earned value analysis considering the irregular fluctuation of performance resulting from the characteristics of OSS development and management. The operation phases of many OSS projects are influenced from external factors by triggers such as the difference of skill, time lag of development, and maintenance.
