Motivational Interviewing

What it is

The method starts from a clinical observation about arguments. When a counsellor supplies the reasons a person should change, the person is left with the other half of the conversation, which is the case against. Motivational interviewing hands both halves back. The practitioner asks open questions, withholds judgement, and works to get the patient stating their own reasons out loud, on the grounds that a reason you have produced yourself is harder to argue with than one you have been given.

The readiness ruler is the best-known instrument in it and the most misunderstood. A practitioner asks how ready a person is to change, on a scale from nought to ten, and then asks why the answer is not lower. A patient who says four is invited to explain what the four is made of, which is a request for their own arguments in favour of change, delivered without anyone having asserted that four is the wrong answer. The technique is not a questionnaire and the number is not a score. It is a way of opening a conversation.

Miller developed this out of experimental social psychology rather than out of clinical intuition, drawing on causal attribution, cognitive dissonance and self-efficacy. That lineage is visible in the design. If people infer their own attitudes partly from what they hear themselves say, then getting a person to voice their own case is not a rhetorical trick, it is a mechanism.

The attribution has been corrected here, and the error is worth naming. This publication's vault previously credited Adam Alter with motivational interviewing. Alter describes it in Irresistible and did not originate it. The method is Miller's, first published in Behavioural Psychotherapy in 1983, elaborated with Stephen Rollnick into a full clinical procedure in their 1991 book, now in its third edition. That correction was made on 1 September 2026 and it is the seventh instance of a single failure pattern in this vault, credit landing on the most recently read author rather than on the person who did the work. This pair of cases had a specific signature: the name did not come from the source at all, since Alter names Miller's tradition. It came from a neighbouring note. Whoever was writing reached for the nearest author already in the vault.

The evidence is real and it is not uniform, which is what the mixed tag on this page records and what any article using this material has to say out loud. Systematic reviews find converging support across several behavioural domains, with the strongest and most replicated results in alcohol and other drug use. Reviewers also record persistent methodological problems across the literature and substantial heterogeneity between domains, so effects outside substance use are less secure and often small. The size of the benefit depends heavily on the behaviour, the setting, and how faithfully the practitioner is actually doing the method rather than a friendly-sounding approximation of it. An evidenced clinical method, then, rather than a settled one.

One editorial position follows from that and this page states it before anything else does. This is addiction-treatment material. The readiness ruler is not presented here as a tool a reader can use on themselves or on a family member, and nothing in this method substitutes for treatment.