This paper describes a qualitative study which explored the views abou
t challenging behaviour of staff in day centres for people with learni
ng difficulties. Respondents' abstract definitions stressed the relati
vity of the concept. However, they readily, cited concrete illustrate
incidents of challenging behaviour which involved physical, sexual and
verbal assault, noise, non-compliance, non-communication and exposure
to danger. Staff explained specific incidents variously, but mono-cau
sally, in terms of service users' dispositions, circumstances and inte
raction strategies. Respondents' own actions were included in explanat
ory schema only rarely. Despite its nebulous definition, challenging b
ehaviour became organisationally, fixed through staff allocation metho
ds, and through a regulatory system designed to prevent abuse. Staff,
caring for large numbers of service users en masse, faced a risk manag
ement dilemma. Labelling an individual as challenging could forewarn c
olleagues about possible dangers. However, such strategies could damag
e the quality of services which a labelled person received, exacerbati
ng the initial problem.