"I think the client is doing better" — why that's not enough
The problem: intuition vs data
Most therapists are confident they can detect when a client is deteriorating. It feels natural: years of training, clinical experience, empathy — all of this shapes professional intuition. Yet research over the past two decades consistently shows that clinical judgment systematically overestimates therapy progress.
The problem is not the competence of any individual clinician. The problem lies in cognitive biases inherent to all humans — including highly qualified practitioners. Confirmation bias, anchoring effects, and the illusion of control operate silently and consistently.
Clinical intuition is a valuable tool for generating hypotheses. But without objective data, it becomes the primary source of systematic errors in evaluating therapy progress.
The Hannan et al. study
In 2005, Chris Hannan and colleagues conducted one of the most revealing studies of clinical accuracy. 48 therapists observed 550 clients and regularly made predictions: would a given client deteriorate by the end of therapy? In parallel, clients completed standardized questionnaires (OQ-45) after every session.
The result was striking. Out of 40 clients who objectively deteriorated, therapists correctly predicted the decline in only 3 cases. That is 7.5% accuracy — significantly worse than chance.
Therapists tended to believe their clients were improving, even when objective data pointed to the opposite.Hannan et al., 2005, Clinical Psychology & Psychotherapy
Why this happens
There are several reasons why even experienced clinicians systematically err in evaluating progress. Each one reinforces the others, creating a persistent blind spot in clinical practice.
- Confirmation bias: the therapist notices information confirming their hypothesis and overlooks contradictory evidence.
- Therapeutic alliance: a strong bond with the client interferes with objective assessment.
- Information self-selection: clients more often talk about what improved and less about what worsened.
- Countertransference: unconscious emotional reactions of the therapist influence assessment.
- No baseline: without initial measurements, objective tracking of progress is impossible.
Therapeutic alliance as a source of bias
Paradoxically, one of the most important components of successful therapy — the therapeutic alliance — is simultaneously a source of bias. The better the relationship between therapist and client, the harder it is for the therapist to accept that therapy is not working. This is not a weakness — it is a feature of human psychology.
The scale of the problem
The Hannan et al. study is not an isolated case. Lambert's meta-analysis (2013) showed that 5-10% of therapy clients deteriorate, and another 35-40% show no meaningful improvement. Without systematic monitoring, therapists detect only a small fraction of these cases.
According to Lambert, when feedback systems (OQ-45, PCOMS) are used, therapists are twice as likely to adjust the course of therapy in time — before the client drops out or their condition significantly worsens.
At the scale of clinical practice, this means that every tenth client leaves therapy in a worse state than when they started — and the therapist may not know it. Systematic measurement does not replace clinical judgment, but makes it more precise.
What patients say
Studies of client experience reveal an interesting pattern: clients who regularly complete standardized questionnaires more often report feeling "heard." Formalized feedback creates space for topics that a client may be hesitant to raise in conversation.
When I filled out the questionnaire, I could mark things I didn't dare say out loud. It was easier than starting the conversation myself.From a client testimonial, Solstad et al., 2019 study
Measurement-based care changes not only the therapist's work but also the client's experience. When clients see their results over time, it strengthens motivation and the sense of control over the process — two key factors in successful therapy.
Conclusion: data changes everything
Clinical intuition is not the enemy — it is an ally that needs support. The research evidence is clear: combining professional judgment with systematic measurement produces better outcomes than either approach alone.
Measurement-based care is not bureaucracy, nor a sign of distrust in the specialist. It is a tool that allows the therapist to see what cannot be seen with the naked eye: hidden trends, unnoticed deterioration, subthreshold changes. It is what turns good therapy into precise therapy.
Three out of forty is not an indictment of clinical intuition. It is an invitation to strengthen it with objective data. When a therapist combines experience with measurement, everyone wins: the specialist and the client.