Abstract. This paper experimentally evaluates the usefulness of a business application framework from a viewpoint of saving cost and quality of the software in a company. Here, we conducted two case studies. In the case studies, four kinds of applications are developed. Each of them is developed in two ways: using framework-based reuse and conventional module-based reuse. Then, we evaluate the difference among them using the several functionality and complexity metrics. As the results, the framework-based reuse would be more efficient than the module-based reuse in the company.