This paper aims to discuss engineering aspects for an agent-based ambient assisted living system for the home environment using argumentation for decision making. The special requirements of our system are to provide a platform with cost-effective specialized assisted living services for the elderly people having cognitive problems, which will significantly improve the quality of their home life, extend its duration and at the same time reinforce social networking. The proposed architecture is based on an agent platform with personal assistant agents that can service users with more than one type of health problems.