A study of 20 trainers and their trainees in general practice showed that trainees had a statistically significant improvement in their diagnosis of otitis media during their trainee year and also became quicker in the time taken for history taking and examination. There was a fall in trainees' prescribing of antibiotics for otitis media during the study but this was accompanied by a notable rise in prescribing of decongestant-antihistamine mixtures to a level similar to that of the trainers. Trainees seemed to accept readily their trainers' prescribing policies and were hesitant to challenge them. An important finding was that trainees had little influence on trainers' prescribing, the latter showing no appreciable changes during the study.