ABSTRACT The article reports on a survey of English primary school head teachers? opinions on disruptive behaviour, coupled with a one?day exercise in the monitoring of disruptive incidents in the same schools. Eighty?five highly experienced head teachers from 38 local education authorities responded to an extensive questionnaire and 77 schools monitored incidents. Schools were categorised by the LEAs as potentially ?difficult?, ?of average difficulty? and ?easy? in respect of intake. Thirty?six Principal Educational Psychologists contributed briefly on a question on age (...) of onset. Findings relate to (a) an examination of the question whether the age of onset of disruptive behaviour is getting earlier, (b) the differing perceptions of questions concerning disruptive behaviour of head teachers, in schools of varying potential difficulty of intake, and (c) the coping strategies used and favoured by head teachers in their work with disruptive behaviour. (shrink)