Therapeutic Alliance Scale
Therapeutic Alliance Scale (THAS) · Also known as: THAS, TAS, Therapeutic Working Alliance Scale
The Therapeutic Alliance Scale (THAS) is a clinician-rated measure of the quality of the therapeutic relationship and working alliance, developed by Raue, Goldfried, and Barkham. Distinct from client-rated measures like the Working Alliance Inventory, the THAS captures the therapist's perception of goal alignment, task agreement, and emotional bond. It is used primarily in research to examine alliance from the therapist perspective and to understand therapist–client congruence in alliance perception.
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When to use it
The THAS is used in: (1) psychotherapy research examining alliance from therapist perspective; (2) therapist training and supervision to develop alliance awareness; (3) studies comparing therapist and client alliance ratings (congruence research); (4) outcome studies where therapist alliance rating is an exploratory variable; (5) clinical settings where supervisors want to audit therapist alliance perception across a caseload. The THAS is most valuable as a training tool—therapists who regularly complete alliance self-assessment become more attuned to the relationship. It is not a routine outcome measure in practice but rather a clinical reasoning and research tool.
Strengths & limitations
- Therapist perspective on alliance is important; therapists' reflection on relationship quality can prompt repair work.
- Complements client-rated measures; therapist–client discrepancy is clinically informative and predictive of dropout.
- Efficient (2–3 minutes); minimal burden on therapists even if administered frequently.
- Operationalizes Bordin's tripartite model consistently with WAI; enables direct comparison.
- Used in training and supervision; therapists who reflect on alliance via the THAS develop greater relationship sensitivity.
- Transdiagnostic; not tied to diagnosis; applicable across therapy modalities and client populations.
- Therapist response bias: therapists tend to over-rate alliance, especially early in therapy, due to therapeutic optimism or social desirability.
- Therapist ratings do not predict outcome as strongly as client ratings; client perspective is the more robust signal.
- Limited construct validity research; far fewer published validation studies than WAI or SRS.
- No longitudinal data on therapist alliance trajectory; most studies measure at one or two timepoints rather than every-session tracking.
- Cross-cultural validation is minimal; most evidence is from North American and European samples.
- Therapist skill in honest self-assessment varies; some therapists consistently rate high regardless of actual alliance quality.
- The measure is not commonly used in routine practice, limiting normative data and clinical interpretation guidelines.
Frequently asked
Why might a therapist rate alliance high but a client rate it low?
Therapists often experience alliance differently than clients. Therapist high / Client low typically indicates: the therapist is confident in the approach and perceives collaboration, but the client feels misunderstood, unsupported, or unclear on goals. This discrepancy predicts dropout; it is a clinical red flag. Discussion of the THAS result in supervision should prompt: 'What might the client not be saying directly? How can I check in on the client's perspective?'
Should I complete THAS every session or just periodically?
For training or supervision, every-session THAS (post-session) is most valuable; it builds therapist habit of alliance reflection. In routine practice, monthly or as-needed (after suspected rupture) is sufficient. The measure's value is in conscious reflection, not administrative compliance; one thoughtful THAS post-session in supervision is more useful than 10 completed without review.
What if my THAS and the client's WAI ratings show big discrepancy?
Bring it to supervision. A therapist rating Alliance=4.5 and client WAI=45 warrants exploration: 'What's your sense of this gap? What might the client be experiencing that you're not picking up?' This is an opportunity to develop therapeutic flexibility and attunement. Don't defend your rating; use the discrepancy as data about the relationship.
Is THAS useful in couples or family therapy?
Less established. Therapists in couple/family work juggle multiple alliances (with each partner, with the couple as unit, with the family as unit). A single THAS score does not capture this complexity. Some supervisors ask therapists to rate alliance separately with each family member, but this is less validated. Use clinical judgment; focus on client-rated measures (client WAI or couple-adapted versions) as the primary signal.
What if I consistently rate alliance high but have high dropout rates?
This is a strong signal that your self-perception may not match client experience. In supervision, review recordings or client feedback (SRS scores if available); compare your THAS with objective outcomes (completion rates, symptom change). The discrepancy suggests over-optimism or misattunement. Work with a supervisor on developing greater client-centered awareness and alliance repair skills.
Sources
- Raue, P. J., Goldfried, M. R., & Barkham, M. (1997). The therapeutic alliance in psychodynamic-interpersonal and cognitive-behavioral therapy. Journal of Consulting and Clinical Psychology, 65(4), 582–587. DOI: 10.1037/0022-006X.65.4.582 ↗
- Hartley, D. E., & Strupp, H. H. (1983). The therapeutic alliance: Its relationship to outcome in brief psychotherapy. In J. Masling (Ed.), Empirical studies of psychoanalytic theories (Vol. 1, pp. 1–37). Lawrence Erlbaum. link ↗
How to cite this page
ScholarGate. (2026, June 3). Therapeutic Alliance Scale (THAS). ScholarGate. https://scholargate.app/en/psychotherapy-research/therapeutic-alliance-scale
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