The object of this study was to develop a self-report instrument that could be used to describe the actual content of secondary school teachers' jobs. Variables The main measures were a pilot (485 item) and refined (245 item) checklist of job operations. A very limited amount of biographical data was collected - specifically characteristics which were likely to be closely related to job content (experience, sex, scale, subjects, additional responsibilities). The remaining data comprised teachers' ratings of the importance and the incidence within their jobs of a set of activities derived from the checklist responses.