P. Novais et al. (Eds.): Ambient Intelligence - Software and Applications, AISC 153, pp. 11–18. springerlink.com © Springer-Verlag Berlin Heidelberg 2012 Guardian: Electronic System Aimed at the Protection of Mistreated and At-risk People Ricardo S. Alonso, Dante I. Tapia, Óscar García, Fabio Guevara, José A. Pardo, Antonio J. Sánchez, and Juan M. Corchado * Abstract. Ambient Intelligence (AmI), based on ubiquitous computing, represents the most promising approach between people and technology to solve the chal- lenge of developing strategies that allow the early detection and prevention of problems in automated dependence environments. One of the most influenced areas by AmI-based systems will be security and, more specifically, the protection of people under risk situations, including cases of mistreatment or loss. This will contribute to improve important aspects of the quality of life of these people, spe- cially their safety. This paper describes Guardian, an integral solution designed for improving the protection of mistreated and at-risk people. Keywords: Ambient Intelligence, Mistreatment, Safety, GPS, GPRS, ZigBee. Introduction According to statistical data from the Ministry of Interior of Spain [1], from 2006 to 2008 more than 60 women were killed in Spain each year by their couples or ex-couples. In 2008, a 23% of the killed women had filed a formal complaint against their murderers. In this regard, this paper describes Guardian, an Ambient Ricardo S. Alonso · Dante I. Tapia · Óscar García · Fabio Guevara R&D Department, Nebusens, S.L., Scientific Park of the University of Salamanca, Edificio M2, Calle Adaja, s/n, 37185, Villamayor de la Armuña, Salamanca, Spain e-mail: {ricardo.alonso,dante.tapia,oscar.garcia, fabio.guevara}@nebusens.com José A. Pardo · Antonio J. Sánchez · Juan M. Corchado Department of Computer Science and Automation, University of Salamanca, Plaza de la Merced, s/n, 37008, Salamanca, Spain e-mail: {jose.pardo,anto,corchado}@usal.es