The period from the 1880s to the 1920s saw the mapping-out of many of the basic co-ordinates of psychology, within which the discipline continues to develop. A number of major traditions of psychological theory and research (particularly experimental psychology, psychoanalysis, psychometrics, and behaviourism) were established during this period. Large areas of what one might call 'psychotechnology' also originated at the same time, e.g. practices in the name of professional psychology in the fields of education, mental disorder and handicap, crime and delinquency, and advertising.' This period can also be seen as that of the installation of many of the structures and practices of social administration which have since been an integral part of life in most parts of the industrialized capitalist world, e.g. the universalization of education, social work in its various forms, and the mental health services. In short, it is the formative period of welfare capitalism, and during it certain social movements were instrumental in calling forth and giving shape to the new apparatuses of welfare, e.g. eugenics,3 the child study movement,' the concern with national efficiency and the mental hygiene movement.' Many of the ways in which these movements informed and were informed by the emergence of psychotechnologies are well documented, e.g. the relationship between eugenics and psychometrics.'These wider social developments are obviously a crucial part of the context within which the history of psychology is to be understood. Another part of that context is examined by occupational sociology, namely the domain of intra-and inter-professional relations. Here we have to consider, amongst other things, the processes of negotiation, confrontation, and attrition by which are defined the boundaries between adjacent occupational groups and their conceptual and institutional terrains.