The effectiveness of a brief, nondirective person-centered practice
This study serves as a replication of earlier findings on the effectiveness of client-centered therapy and a refutation of the need for specificity and directiveness in brief, efficacious treatment. It also provides a quality low cost model for individual therapists to address the single most stressful aspect of their work, the perception of lack of therapeutic success (Farber & Heifetz, 1982). Using four global indexes, results showed consistent improvement across clients in a college counseling center throughout the weeks of brief therapy, with the most dramatic gains seen within the first four weeks of therapy with virtually every client (97%). The average effect size across outcome measures was 0.97. The research found significant correlations between the various measures, adding to its validity.
Cornelius-White, Jeffrey HD. "The effectiveness of a brief, nondirective person-centered practice." Person-Centered Journal 10, no. 1 (2003): 31-38.