The present work has been developed from an accurate study on the Wearable Devices within the SHELL project (Secure Habitat for an Enhanced Long Living), led by the Department of Architecture in Genoa, which focuses on “Made in Italy” industrial innovation. The project seeks to create a new assistance system for mentally disabled people or people with reduced mobility (Stikic et al., PervasiveHealth 2008, Second International Conference on Pervasive Computing Technologies for Healthcare, 2008)[1] using SHELL Personal Kit: a Secure