The purpose of this study is to analyze the management of the organizational change process that happened in the health plan of pension fund GAMA company, from July 2005 to July 2007. The company was facing a financial problem in the health plan and was suffering with the low professionalization of this business in particular. The case study tried to analyze the applicability of Rosabeth M. Kanter, Barry A. Stein e Todd D. Jick´s model of the ten commands to the organizational change that happened in GAMA company and to identify the perception of the administrators and the employees about the results of the process. The analysis showed that although the financial results intended in the beginning of the process were achieved, the process was interrupted before the new behavior factors were introduced in the culture of the organization, compromising its sustainability at long term. The study indicates that, if followed all stages, ten commands model can help the conduction of an organizational change process. Nevertheless other factors must be also considered like leadership style and human dimension, which is also affected by this type of process.