This book describes a research project concerning the social participation of people with aphasia. After a period of rehabilitation, most people return to their home were they are confronted with a social and physcial environment, unadjusted to the consequences of aphasia. Mostly they do not succeed in picking up their life as before the stroke. People with aphasia experience a changed social participation. This dissertation describes five studies: 1)a systematic literature research to investigate what is known in the literature about participation in people with aphasia, 2)a study to identify and describe measures of social participation that may be specifically useful when measuring participation in people with aphasia, 3)a psychometric study with regard to the Community Integration Questionnaire adjusted for people with aphasia, 4)a qualitative study to explore how people with aphasia perceive participation in society and to investigate influencing factors, 5) a quantitative study to describe how people with aphasia participate socially and the factors which are related to social participation. This book is helpfull for all health care professionals working with aphasia.