A Closed-Loop Simulator of Long Term Care Systems for Elderly People ⋆ Francisco Grimaldo 1 , Juan M. Ordu˜ na 1 , Francisco R´ odenas 2 , and Jorge Garc´ es 2 1 Departamento de Inform´ atica, Universidad de Valencia, Spain {francisco.grimaldo,juan.orduna}@uv.es 2 Polibienestar Institute, Universidad de Valencia {francisco.rodenas,jorge.garces}@uv.es Abstract. Health costs associated with the long-term care of elderly people have increased in all European countries last years. In order to tackle this problem, some models have been proposed to provide inte- grated care services to elderly people. However, the use of these models can have long-term effects in the national healthcare systems and the use of computer-based simulation tools becomes necessary. In this paper, we propose a simulator using as a starting point a holistic model of care systems for people that need long term care, the Sustain- able Socio-Health Model (SSHM). The implementation of the simulator on the Jason multiagent platform allows the tool to include the human interactions, preferences and social abilities that take place between el- derly people and the staff of healthcare systems (doctors, social workers and nurses). Also, the use of this multiagent platform provides the re- quired scalability for simulating population sizes of different orders of magnitude. The closed-loop design of the proposed simulator allows to repeatedly simulate successive interactions of the considered population with the healthcare system. As a result, the simulator can forecast the long-term effects of different policies on the considered population as well as on the health system. Keywords: Multiagent based simulation; long term care;social sustain- ability; elderly people. 1 Introduction Technological and scientific advances have produced a society with an unprece- dented high share of elderly people and people with chronic diseases [37]. As a result, the health costs associated with the long-term care of elderly peo- ple have increased. The substantial growth in health expenditures in European Union (EU) countries over recent decades has brought about serious problems for ⋆ This work has been jointly supported by the Spanish MICINN, the European Com- mission FEDER funds and Generalitat Valenciana under grants TIN2009-14475- C04-04, CSO2009-12086, PROMETEO/2010/065, and ACOMP/2012/235.