All social work activity is influenced by the society in which it takes place. It is therefore inescapable that understanding sociology should help social workers to make a more effective contribution to people's welfare. The different perspectives which constitute sociology are examined and the book analyses the ways peoples' lives are powerfully influenced by social forces and 'social problems'. It is argued that sociology should help social workers to examine their assumptions and value judgements and develop their capacity to be questioning and discriminating about their methods and the policies which affect them and their clients.