Behavioral Skills Training (BST) is an effective training package that consists of instructions, modeling, rehearsal, and feedback. Although the efficacy of BST has been demonstrated, previous research has not clearly delineated its active components. This study used an alternating-treatment design embedded within ABC and ABCD designs to evaluate the independent effects of all components of BST for training teachers to conduct functional analyses. Prior to baseline, teachers reviewed written instructions. Following baseline, modeling, rehearsal, and feedback training occurred independently during the first training phase and in combination during subsequent training phases. Rehearsal was ineffective, whereas feedback was effective at improving the performance of all teachers. Modeling was less effective than feedback, such that improvements only occurred for some teachers and some functional analysis responses. Thus, feedback, and to a lesser extent, modeling are the effective and perhaps necessary components of BST. Copyright (c) 2012 John Wiley & Sons, Ltd.