The purpose of this study was to develop a teaching quality assessment questionnaire and assess its reliability by using it with a sample of first-year medical students. Principal components analysis with varimax orthogonal rotation resulted in the development of a 12-item, two-component tool, adequate for use in lectures and small-group sessions. The two components were named "curriculum" and "relationship". The Cronbach coefficient alpha values indicated high reliability and internal consistency. According to the results obtained this teaching quality scale is a reliable measure and may be useful in identifying themes in disciplines and among teachers that may benefit from some professional development. Amongst its advantages is that it can be used with an optical reading tool. (Contains 4 tables.)