Health care software gets better user efficiency, efficacy and satisfaction when the software is designed with their users' needs taken into account. However, it is not trivial to change the practice of software development to adopt user-centered design. In order to produce this change in the Health Informatics Department of the Hospital Italiano de Buenos Aires, a plan was devised and implemented. The article presents the steps of the plan, shows how the steps were carried on, and reflects on the lessons learned through the process.