The growing number of older people emerges the need to consider autonomy concerns for those people and their need for intensive care. Plenty of researches, such as those in the domain of Ambient Assisted Living Systems, have been carried out to create enhanced conditions for older people and people with disabilities, based on providing ICT solutions that enhance the well-being of elderly people and provide them with well independent daily living. This paper discusses how the efficiency for AAL solutions is achieved, through the identification and introduction of different essential requirements that should be realized to meet the objectives of ALL systems towards their various users, including family members and caregivers. Set of systems has been introduced with their solutions and architectures, to reach the main goal of this work, by evaluating these systems based on the proposed requirements, whether they meet the requirements, by studying system functionalities.