The primary purpose of this longitudinal, quasi-experimental study was to investigate the effects of a bipartite, standardized case conceptualization training among participants in comparison to those who were exposed to both the training and deliberate practice coaching. The secondary purpose of this study was to examine the relationship of the training and aspects of deliberate practice, along with participants' attitudes toward evidence-based practice (EBP). A total of 84 counselor trainees were recruited from two South Florida universities. Participants in both the experimental group (n = 35) and comparison group (n = 49) received two, three-hour training lectures, which explained the integrative case conceptualization model developed by Dr. Len Sperry in 1989. Over a period of eight weeks, the lectures were separated by approximately four weeks in order to assess whether the training effects persist over time. As measured by the Views About Case Conceptualization (VACC) instrument, the first training lecture effectively reduced case conceptualization myths for both groups by approximately 4 points (out of 25), t (83) = -8.53, p [less than] 0.001. Repeated measures MANOVA showed that the training had a significant impact on the entire sample. As measured by the Case Conceptualization Evaluation Form (CCEF) 2.0, the comparison group's overall mean score improvement was approximately 40 points (out of 100) and the experimental group's overall mean score improvement was approximately 63 points (out of 100), F (4.256, 348.974) = 32.102, p [less than] 0.001. The results reveal that the training and coaching had a significant effect on counselor trainees' ability to write effective case conceptualizations with a partial eta-squared effect size of 0.281.Using both the Evidence-Based Practice Attitude Scale (EBPAS) and Moulaert Questionnaire, this study also examined the influence of attitudes toward EBP and aspects of deliberate practice on trainees' case conceptualization competence. Paired samples t-tests and correlation analysis revealed that participants became more "open" to EBP, t (83) = -5.280, p [less than] 0.001. However, it was determined that coaching did not act as a mediating or moderating variable. Overall, the findings support that case conceptualization training and deliberate practice coaching increase counselor competence, and that the effects persist over time. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://bibliotheek.ehb.be:2222/en-US/products/dissertations/individuals.shtml.]