Software maintenance is the most expensive and least predictable stage of the software life cycle, representing in some cases between 67 and 90 of total costs. On the other hand, it is well known that the structure of a work team influences on the productivity of its members. We can help to decrease costs of maintenance through the definition of an adequate sturcture of the work team and with the clear identification of the tasks which every member must execute. In this work we expose the results that, in this sense, we have obtained from the application of MANTEMA to real projects. MANTEMA is a methodology for supporting software maintenance, developed jointly by our university and Atos ODS, an international enterprise among whose primary business activities is the outsourcing of software maintenance. Atos ODS is using MANTEMA in big projects of Spanish banking.
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