The Central Question

One of the longest-running debates in professional psychology is whether clinical competence can be reliably measured. The assumption behind licensure exams is straightforward: test whether someone is competent before allowing them to practice. But what does "competent" actually mean, and can we measure it in a way that connects to real-world outcomes?

A 2023 study by Dimmick, Callahan, and Cox took a significant step toward answering that question.

The Study

Published in Training and Education in Professional Psychology, the study examined 92 trainees and 192 clients at a psychology training clinic. The researchers used the Practicum Evaluation Form (PEF) — a structured supervisor rating of trainee competency — and linked those ratings to actual client outcomes measured by the OQ-45.2, a widely used therapy outcome measure.

The question was direct: does measured trainee competency predict how clients actually do in therapy?

The Findings

Yes. Significantly.

  • Each one-point increase in trainee competency rating was associated with a 42% reduction in client dropout (Risk Ratio = 0.58, 95% CI: 0.37–0.88)
  • Competency ratings explained more than 10% of variance in client symptom change — a meaningful effect size that's on par with the effect of specific treatment modalities
  • Foundational competencies (research skills and interpersonal skills) accounted for 7.4% of outcome variance
  • Functional competencies (assessment, supervision, consultation) accounted for 4.5%

To put this in perspective: the competency of the individual therapist matters at least as much as the specific therapy technique being used. The person delivering the treatment is as important as the treatment itself.

Why This Matters for Candidates

This research has two practical implications for people preparing for the EPPP:

1. Your clinical skills are real and measurable

If you've spent years developing clinical competence through practicum, internship, and supervised practice, that competence is genuine and consequential. It predicts real outcomes for real clients. The EPPP tests a different dimension — knowledge breadth and test-taking efficiency. Both matter, but they're not the same thing.

If you're a strong clinician who struggles with standardized testing, this research validates your experience. Your clinical skills are not less real because they don't translate directly to multiple-choice performance.

2. The exam is one gate, not the whole fence

Competence in psychology is multidimensional. The EPPP tests foundational knowledge across eight domains — a necessary but not sufficient component of professional readiness. Your supervised clinical experience, your ability to build therapeutic alliances, your ethical judgment in complex situations — these are all critical dimensions of competence that predict client outcomes but aren't captured by a knowledge-based exam.

Understanding this helps you approach the EPPP with the right mindset: it's a specific hurdle that tests a specific skill set. Prepare for it on those terms, and don't let exam anxiety define your sense of professional identity.

The Emerging Picture

Competency assessment is a rapidly developing area in professional psychology. Researchers are building psychometrically sound tools — like the PEF used in this study (person reliability r = .99, item reliability r = .92) — that can reliably measure clinical skills and connect them to patient outcomes.

For the field, this opens the door to more comprehensive approaches to licensure and credentialing. For you as a candidate today, the practical takeaway is this: the EPPP is one measure of one dimension of your professional readiness. Prepare for it strategically, pass it, and then keep building the clinical competence that actually changes clients' lives.

References

Dimmick, A. A., Callahan, J. L., & Cox, R. J. (2023). Further validation of competency assessment: The practicum evaluation form. Training and Education in Professional Psychology, 17(3), 269–276.

Wampold, B. E., & Imel, Z. E. (2015). The great psychotherapy debate: The evidence for what makes psychotherapy work (2nd ed.). Routledge.