The purpose of this study was to investigate the efficacy and efficiency of a training package to teach public school special educators to conduct functional analyses of challenging behavior. Six public school educators were divided into two cohorts of three and were taught two models of functional analysis of challenging behavior: traditional and trial-based functional analysis. The effect of the training package on functional analysis implementation was evaluated using multiple-baseline designs across participants for each functional analysis model. The sequence of functional analysis models taught was counterbalanced across cohorts. Following the training package, all participants reached 100% implementation fidelity during role-plays and classroom sessions with students, and maintained high fidelity at follow-up role-play sessions. Data on training duration, trials to criterion, and social validity revealed that trial-based functional analysis training had a shorter duration and was rated as the more favorable functional analysis model.