Abstract
Open source software (OSS) products have been broadly utilized for the IT business as well as the personal use in recent years. Software companies can receive much benefit from OSS products in terms of cost to develop and maintain their products. However, there are also risks that products of interest might become no longer being successfully maintained by the OSS developers because a successful maintenance is not obligation of developers. In order to evaluate a project's health from a perspective of a macroscopic trend analysis, this paper focuses on the distribution of the developer's contribution to an OSS project, and analyzes the relationships of distribution features with the quality of products. The empirical analysis with 32 popular OSS projects shows that the length of tail in the Pareto chart can be a health index of an OSS projectin terms of the balance between bug fix and feature upgrade.
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