This paper defines software maintenance activities and develops a model for maintenance cost estimation of package software. First, we classified software maintenance activities which were collected from the literature reviews. Second, we developed a cost structure for package software maintenance based on the identified activities. Third, the activity-based software maintenance cost estimation model was developed based on the software maintenance activities and cost structure. Fourth, we defined the adjustment factors for the software maintenance cost estimation model to improve the accuracy of the developed model. Finally, the developed model was verified using actual data from software maintenance projects. The proposed model showed reliable performance in terms of the mean magnitude of relative error and prediction quality. Therefore, the proposed model is suitable for setting budgets and predicting costs associated with package software maintenance projects.

本文定义了软件维护活动，并为包装软件的维护成本估算建立了模型。首先，我们对从文献综述中收集的软件维护活动进行了分类。其次，我们根据确定的活动为软件包软件维护开发了一种成本结构。第三，基于软件维护活动和成本结构，建立了基于活动的软件维护成本估算模型。第四，我们定义了软件维护成本估算模型的调整因子，以提高开发模型的准确性。最后，使用软件维护项目中的实际数据验证了开发的模型。提出的模型在相对误差的平均幅度和预测质量方面显示出可靠的性能。因此，