This paper describes how the DTI funded 'Care in the Community Centre' led by British Telecom PLC (UK), has developed a concept model to represent an individual's well-being. The paper goes on to provide an in-depth explanation of the data analysis techniques used to monitor changes in well-being. By combining related sensor events (sensors in the activity based sensor groups), the activity of the client can be inferred. This not only provides an overall assessment and better representation of the data but also highlights significant (i.e. noteworthy) events. The aim to provide caregivers with a tool that enables them to make more appropriate and timely decisions regarding the well-being of their clients. The social interaction of the client with visitors is used as an example activity and is explained in detail to show the capabilities of the system. The data pre-processing and analysis techniques used are heavily reliant on fuzzy sets and fuzzy reasoning techniques in order to deal with the vagueness and incompleteness of the data.