Issue handling performance in proprietary software projects

Software maintenance tasks are mainly related to fixing defects and implementing new features. Higher efficiency in performing such tasks is therefore going to reduce the costs of maintenance. A previous study involving open source systems has shown that higher software maintainability corresponds to faster speed in fixing defects [1]. In this paper we replicate the previous study by mining bug report data of three proprietary software projects. In one of the projects, a correlation between higher software maintainability and faster defect resolution is confirmed. The quality of issue handling process (e.g., issue registration accuracy and completeness, scope and complexity of issue workflow) should be considered in further research as it might explain the circumstances under which the correlation can be observed.