Since its origins, cognitive analytic therapy (CAT) has become a focused and more effective alternative that can be approached from the first line of action by mental health teams. However, since CAT incorporates in its intervention aspects of other currents, it is possible that its limits and specificity may have blurred. Furthermore, therapists in training use to report difficulties related to this. For that reason, assessing the competence of CAT therapists in training becomes so important, as it promote the reflection of the therapist in its training and provides professionals necessary skills to ensure a better quality care for their patients.

The aim of this study was to design an instrument to identify the main training problems in CAT therapists which allows therapist's competence evaluation.

For this purpose, a specific tool to detect the main problems in the implementation of the psychotherapy by self-report was administered and evaluated by two therapists in training during its clinical practice.

The main implementation problems detected had to do with collusions and the temporary adjustment of the sessions. The therapists reported a high satisfaction with the instrument, which was valued as useful to be aware of the problems in CAT training and with clearly explained contents.

The tool has been shown to be useful to assess therapist's competence and to take awareness of collusions allowing the therapist to avoid them.

The authors have not supplied their declaration of competing interest.