This study compared the scores obtained on the Minnesota Importance Questionnaire, the Strong Vocational Interest Blanks for Men and Women, and the General Aptitude Test Battery by groups of relatively effective and relatively ineffective counselor trainees. The trainees completed the tests prior to their first practicum experience and were evaluated by their practicum supervisors at the end of each of their practica. The subjects were classified as relatively effective (n = 32), relatively ineffective (n = 30), or indeterminant (n = 12) on the basis of their practicum supervisor's evaluations. The scores of the relatively effective ana relatively ineffective trainees were compared using one-way analyses of variance. The data revealed significant differences in the needs, interests, and abilities of the groups. The relevance of these findings for the selection of counselor trainees is discussed.It is widely believed that personal and nonintellective qualities are basic to effective functioning in a counseling relationship (Rogers, 1962;Traux & Carkhuff, 1967;Williamson, 1965). Accordingly, counselor educators have advocated the use of scores on personality and interest tests in lieu of or in addition to Graduate Record Examination (GRE) scores for predicting success in counselor training. Several investigators (e.g., Heikkinen & Wegner, 1973;Jansen, Robb, & Bonk, 1970Passons & Dey, 1972) have reported a relationship between performance as a counselor and scores on personality tests. The exact nature of the findings, however, has varied from study to study.A literature review revealed no studies in which the relationship between interest test scores and performance in a counseling setting was investigated. Moreover, we found no investigation in which the subjects had been admitted to graduate school without their GRE scores' forming part of the basis for admission. The present research investigated the relationship between aptitude-and interest-test scores and effectiveness in counseling practica.