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Ambient Assisted Living is a research area which has emerged to assist individuals in performing their everyday activities with the help of ambient intelligence technology. To accomplish this, technological aspects such as context acquisition, device integration, networking, and social aspects such as accessibility, usability, privacy, and others, play an important role. These aspects become crucial when assisting the elderly, because they present very specific and demanding requirements. In this paper, we present work in some application scenarios conducted within our research group, focused on supporting the elderly. The implementation of these scenarios is possible through the use of our proposed technological infrastructure consisting of two main parts:(1) a physical platform constituted by sensors, actuators, RFID tags, and other devices, and (2) a software platform providing Web services with basic blocks such as voice recognition, indoor localization, and others, that can be composed to construct more sophisticated services.