Background: Previous research has suggested that severity of intellectual disability (ID) and topography of behaviour may influence staff causal attributions regarding challenging behaviour. Subsequently, these causal attributions may influence helping behaviours. This study investigated the relationship between attributions of control over challenging behaviour and individual and organizational factors. Methods: A cross-sectional survey using a between-subjects natural groups design was employed. Care staff and managers completed measures to examine the relationship between staff attributions of control over challenging behaviour and client-related variables, staff-related variables and functioning of the organization. Results: Staff attributed challenging behaviour as being less under personal control if the organization was of better quality. Staff attributions of control over challenging behaviours were lower if staff displayed positive attitudes towards the client, the physical and social environment was appropriate and the overall approach to delivering care seemed well-structured. There was no relationship between staff attributions of control and ability of the individual or the overall level of challenging behaviour. However, with respect to specific topographies (i.e. physically aggressive and self-injurious behaviour) there were different profiles of causal attributions made. Discussion: Organizational factors, staff behaviour and the topography of challenging behaviour can each influence the attributions of control that staff make. Any interventions that seek to increase the helping behaviour of staff through manipulation of the attributions that they make need to consider both individual factors (topography of behaviour) and environmental factors (staff behaviour and the quality of the service and organization). (Contains 2 tables and 1 figure.)