Immunization information systems and registries are essential for vaccine programs to succeed. Personal Health Record should improve decision making of healthcare providers and consumer outcomes. This article aims to describe the software development of an immunization module using a user-centered design, starting from the analysis of potential users' needs. The design was made through cycles of iterations, adjustments were made validating real scenarios and taking into account the user needs. The main features identified through interviews were: vaccination schedule, further information on vaccines' usefulness, notification, downloadable patient vaccination status and other vaccines outside the official calendar. The final scope is to create a simple, efficient and safe platform for patient immunization management.
Keywords: Personal Health Record; Software Design; Vaccines.