A range of clinicians (n = 72) were asked to provide a definition of a schema. The participants were selected from different parts of the broad church of the CBT community, with all having received some training in CBT – although only 26.4% had a formal CBT qualification. Fourteen themes were identified, suggesting that the concept is perceived to be complex. However, the mean number of themes identified per clinician's definition was small: 2.86 (mode = 2). We consider this finding reflects a problem concerning a lack of clarity with respect to the use of one of the key concepts in CBT.