Observation of counsellor skills through a one-way mirror, video or audio recording followed by supervisors and peers feedback is common in counsellor training. The nature and extent of agreement between supervisor-peer dyads is unclear. Using a standard scale, supervisors and peers rated 32 interviews by psychology trainees observed through a one-way mirror. Results indicated that peers and supervisors used similar dimensions to cluster the various competencies. Peers rated counsellor performance more positively for general counselling skills but not for specialised techniques. Analyses revealed good supervisor-peer agreement for some items and poor agreement on others, with some differences being unacceptably large. The study has important implications for how feedback involving supervisors and peers might be managed and for peer supervision models. Observation of counsellor skills through a one-way mirror, video or audio recording followed by supervisors and peers feedback is common in counsellor training. The nature and extent of agreement between supervisor-peer dyads is unclear. Using a standard scale, supervisors and peers rated 32 interviews by psychology trainees observed through a one-way mirror. Results indicated that peers and supervisors used similar dimensions to cluster the various competencies. Peers rated counsellor performance more positively for general counselling skills but not for specialised techniques. Analyses revealed good supervisor-peer agreement for some items and poor agreement on others, with some differences being unacceptably large. The study has important implications for how feedback involving supervisors and peers might be managed and for peer supervision models. (Gonsalvez & Milne, 2010). First of all, novice trainees lack both competence and confidence, and have to be supported through phases of misgivings and self-doubt as they deal with high levels of affect and difficult psychological problems (Stoltenberg, Bailey, Cruzan, Hart, & Ukuku, 2014). Secondly, the requirement for intensive supervision is mainly determined by the perceived importance of observation that may be immediate (e.g., through a one-way mirror or co-therapy) or delayed (e.g., through review of video or audio recordings). As a supervisory technique, observation is supported by expert consensus (see Reiser, 2014) and by research (e.g., Townend, Iannetta & Freeston, 2002). Conversely, an over reliance on subjective methods is not recommended, because self-report of case work may be unreliable, may miss important information, and may be vulnerable to bias particularly during early stages of counsellor development, when trainees are less capable of accurate self appraisal (Campbell, 1994;Gonsalvez & Calvert, 2014;Townend, Iannetta & Freeston, 2002). Finally, important knowledge-application (e.g., SUPERVISOR AND PEER RATINGS case conceptualization), skills (e.g., generic counseling and other specialized therapy skills) and relationship (e.g., self-awareness and transference reactions) competencies are...