In order to prepare counselor-trainees to practice competently and maximize client outcomes, counselor-trainees must develop a broader understanding and explanation, called a case conceptualization, of their clients presenting problems, personality, and systemic dynamics. There is a limited body of research that examines the effects of training on the ability for counselors to develop an effective case conceptualization. This is the first study to train counselors to develop competence in formulating an integrative case conceptualization. This quasi-experimental study aimed to determine whether an intervention had an effect on the 85 counselors in training that participated in a 2-hour training. Data was analyzed using paired sample t-tests, an independent t-test and correlation methods. Participants’ CCEF scores significantly improved from the training (t = -25.970, df = 84, ES = 3.67, p < 0.001). Participants’ CFCCM scores significantly improved as well (t = -21.693, df = 84, ES = 2.78, p < 0.001). Participants’ scores also significantly improved with their perceptions about case conceptualization (t = -30.828, df =84, ES = 5.47 p < 0.001), for items 1-5. Item 6 resulted in values of (t = -13.295, df = 84, ES = 2.14, p < 0.001). The level of cognitive complexity as measured by the CCQ did not have a significant effect on the quality of the counselors in training case conceptualizations. Compared to the CFCCM, the CCEF is a much shorter and easier instrument for evaluating a case conceptualization. Overall, results of this study provide support that counselors in training can improve their quality of case conceptualization skills in as little as 2 hours. This can aid in understanding and explaining their client’s situation better, which may significantly improve the treatment process and client. / Includes bibliography. / Dissertation (Ph.D.)--Florida Atlantic University, 2014. / FAU Electronic Theses and Dissertations Collection