This chapter provides a range of insights into the empirical reality of particular labour market sectors and the complexity of different employment situations. The selling of labour power, the variation in the terms on which it can be sold, and the social regulations surrounding the contract of employment define a large part of the field of industrial sociology (Brown, 1980). These issues have assumed a growing importance within what has been termed the 'new' industrial sociology (Hill, 1981) as sociologists have belatedly begun to give sustained attention to the operation of the labour market, and to the linkages between career and employment patterns and class formation. Morgan and Hooper subject dual labour market approaches to critical review in their paper; while applauding them for allowing a way into sociological analyses of the labour market which have been lacking in the past, they are sceptical as to the mileage to be got from them.