The goal of SHARE-it, an EU FP6 funded project, is to develop a scalable, adaptive system of add-ons to sensor and assistive technology so that they can be modularly integrated into an intelligent home environment to enhance the individuals autonomy. The system will be designed to inform and assist the user and his/her caregivers through monitoring and mobility help. Thus, we plan to contribute to the development of the next generation of assistive devices for older persons or people with disabilities so that they can be self-dependent as long as possible. We focus on add-ons to be compatible with existing technologies and to achieve an easier integration into existing systems.We also aim at adaptive systems as transparent and, consequently, as easy to use to the person as possible. Scalability is meant to include or remove devices from the system in a simple, intuitive way. SHARE-it will provide an Agent-based Intelligent Decision Support System to aid the elders.