The Anaesthetic Trainee Theatre Educational Environment Measure (ATEEM) was developed to measure the educational environment for trainee anaesthetists in the theatre setting using similar methodology to that of other existing tools. The ATEEM was administered to 271 anaesthetic trainees three months into their post of whom 218 (80%) responded. The ATEEM showed that trainees' perceptions of their educational environments do vary and that this inventory is capable of identifying problem areas that can be remediated by training managers.