The conventional story about expertise goes like this. You train, you qualify, you accumulate experience, and over time you become more skilled. More years equals more expertise. It is a satisfying narrative — it implies that competence arrives on its own, that the main requirement is to keep showing up.
The research on expertise has spent thirty years systematically dismantling this story. It hasn't fully made it across to the CBT training literature yet, which is part of why we are still having this conversation.
What Ericsson's work actually showed
In 1993, K. Anders Ericsson and colleagues published what became one of the most influential papers in the psychology of expertise. They studied violinists at the Berlin Academy of Music, comparing students assessed by their teachers as having the potential for international careers against those assessed as good but unlikely to reach the top tier. The critical finding was not about talent or early aptitude. It was about practice — specifically, about the structure of practice.
What separated the elite performers from the merely competent ones was not total hours logged; it was how those hours were spent. The best performers had accumulated substantially more hours of deliberate practice — defined by Ericsson as practice that is specifically designed to improve performance, operates at the edge of current ability, involves concentration and effort, and includes immediate feedback on errors.
This is not the same as doing the work. A violinist practising a piece they already play well is not engaged in deliberate practice. A violinist repeatedly drilling the passage where they consistently lose accuracy, stopping to correct each error in real time, is.
The same pattern has held up across domains studied since: surgery, chess, sports, medicine. Experience alone — years of doing the work — does not predict the transition from competence to expertise. Deliberate practice does.
Why qualification is not the end of the story
CBT qualification proves something real and important. It demonstrates that you have absorbed the theoretical model, understood case formulation, practised the core techniques in supervised settings, and met a competency standard. That is not nothing.
What it cannot demonstrate is that you have achieved the level of automatic, flexible, high-quality skill that characterises expert clinical practice — where Socratic dialogue feels natural rather than procedural, where you can hold a formulation in mind whilst attending fully to the client in front of you, where the techniques have become genuinely fluid rather than performed from memory.
That kind of expertise is built by deliberate practice, not by qualification. And in most professions where the stakes are high, the people who achieve it do so because the system builds in deliberate practice structures after qualification, not just before it. Medicine knows this — Ericsson's 2008 review in Academic Medicine documents how attending physicians' surgical skill plateaus without continuing deliberate practice, and how experience alone fails to predict performance differences between qualified surgeons.
Psychotherapy has the same problem and, arguably, fewer structural mechanisms to address it.
The Chow et al. finding
The most important study in this area for psychotherapists is Chow and colleagues' 2015 paper: The role of deliberate practice in the development of highly effective psychotherapists, published in Psychotherapy.
Chow et al. studied therapists working in a community mental health setting and divided them into groups based on objective outcome data — specifically, how much improvement their clients showed relative to expected trajectories. They then compared the high- and low-performing groups across a range of variables.
The standard predictors did not differentiate the groups. Training level, years of experience, theoretical orientation, and the amount of time spent in formal supervision all failed to predict who produced better outcomes.
What did predict outcome was the amount of time therapists spent in solitary, structured practice — specifically, reviewing their own recorded sessions, drilling specific skills in isolation, and seeking systematic feedback on their performance. Highly effective therapists invested significantly more time in this kind of deliberate practice than their less effective counterparts, and this remained true even when experience and training were statistically controlled.
This is a finding worth sitting with for a moment. It is not that experienced therapists are no better than trainees. It is that, within a group of qualified clinicians working in the same setting with similar training backgrounds, the therapists whose clients improved most were the ones who spent the most time in structured, feedback-loaded self-improvement — not the ones who had been doing the work the longest.
Experience, in this context, is the raw material. Deliberate practice is what turns it into expertise.
What deliberate practice looks like for a CBT therapist
Ericsson's definition is rigorous, and it is worth being concrete about what it implies for CBT practice. Doing therapy is not deliberate practice in the technical sense, for the same reason that playing concerts is not deliberate practice for a musician. The conditions are wrong: the focus is on performance, not on identifying and correcting specific weaknesses; the feedback is delayed or absent; the difficulty level is set by the caseload, not by your current developmental edge.
Deliberate practice for a CBT therapist looks more like this:
Recording and reviewing sessions against a competency framework. The CTS-R exists for exactly this purpose. Reviewing your own recorded sessions and scoring yourself against each item — not globally, but specifically — surfaces the systematic patterns in your practice that you cannot see in the moment. Where are your Socratic sequences actually going? Are you reaching guided discovery or are you leading the client to the conclusion you already had? Are your collaboration scores genuinely earned?
Drilling specific techniques in isolation. Socratic dialogue is a skill that can be practised outside of a full therapy session. Formulation can be practised with a case vignette. Behavioural experiment design can be rehearsed until the structure becomes second nature. These are not things most therapists do — not because they are unaware that the skills exist, but because there is no infrastructure that prompts or supports the practice.
Practising at the edge of difficulty. The most important implication of the deliberate practice framework is that you should be practising what you find hardest, not what you do well. If imaginal exposure for trauma feels uncomfortable, that is precisely the technique to practise more, not to defer. If your Socratic sequences tend to collapse into psychoeducation when the client is distressed, that is the edge you need to be drilling.
Getting timely, structured feedback. Supervision is essential, but supervision as case discussion is not the same as supervision as deliberate practice. Feedback on your clinical behaviour — specific, technique-level, referenced to observable competencies — is the corrective information that drives improvement. Without it, you are practising in the dark.
Why most therapists don't do this
None of this is secret. The deliberate practice framework has been in the clinical literature for over a decade since Chow et al. published their findings. Training bodies reference it. Supervisors are aware of it. And yet the majority of qualified CBT therapists do not have deliberate practice structures in place.
The reasons are not mysterious. There is no time carved out for it in most jobs. There is no ready infrastructure for recording, scoring, and drilling specific skills. The activation cost of setting it up — finding a recording setup, working out how to apply the CTS-R to yourself, deciding what to practise — is high enough that it is easy to defer indefinitely. And supervision, which could theoretically incorporate deliberate practice elements, is usually oriented toward the client's case rather than the therapist's skill development.
The result is that most therapists' skills plateau at somewhere close to qualification level — not because they are not motivated, but because motivation without structure does not produce deliberate practice. It produces the experience of working hard, which is a different thing.
The infrastructure problem
This points to something important about what expertise development actually requires. It is not a resolve problem. Individual determination is not a reliable practice infrastructure; if it were, more therapists would have solved this problem alone before now.
What deliberate practice requires is structural: a curriculum of drills matched to a competency framework; a feedback instrument that surfaces the right next thing to work on; a practice environment where you can drill at the edge of difficulty without it affecting real clients; and a system that creates regularity and accountability around the practice rather than leaving it as a permanent good intention.
These are not things that can be solved by a more committed mindset, a better supervision relationship alone, or another CPD module. They need to be built. They are also, not incidentally, exactly the structures that the therapist drift literature identifies as the antidote to professional erosion. Deliberate practice and drift prevention are not separate problems with separate solutions — they are the same problem read from opposite ends.
Supervisia is designed as that infrastructure.
The Train pathway gives you AI clients to drill on — imaginal exposure, Socratic dialogue, formulation work — without waiting for the right case to arrive on your caseload. Every drill is scored against the CTS-R. Trainer commentary identifies where the practice is strong and where the edge is. Between supervision sessions, the prompts, the structure, and the feedback loop are already built.
References
- Ericsson, K. A., Krampe, R. T. & Tesch-Römer, C. (1993). The role of deliberate practice in the acquisition of expert performance. Psychological Review, 100(3), 363–406. DOI: 10.1037/0033-295X.100.3.363
- Ericsson, K. A. (2008). Deliberate practice and acquisition of expert performance: A general overview. Academic Medicine, 83(10 Suppl), S70–S81. PubMed: 18344700.
- Chow, D. L., Miller, S. D., Seidel, J. A., Kane, R. T., Thornton, J. A. & Andrews, W. P. (2015). The role of deliberate practice in the development of highly effective psychotherapists. Psychotherapy, 52(3), 337–345. DOI: 10.1037/pst0000015
- Rousmaniere, T. (2016). Deliberate Practice for Psychotherapists: A Guide to Improving Clinical Effectiveness. Routledge.
Last updated: May 2026