There are currently approximately 180,000 Registered Behavior Technicians® (RBT®s) (Behavior Analyst Certification Board, n.d.) To become an RBT, one must complete 40 hours of training and pass a competency assessment and an exam. The initial training is frequently conducted though asynchronous online platforms. To our knowledge, there has been little research on the effects of the initial training for RBTs. The purpose of this study was to evaluate the effects of asynchronous online instruction on a portion of the RBT Competency Assessment - specifically, the effects of training on the measurement section of the task list on the measurement competencies (continuous measurement, discontinuous measurement, and data and graphs). The training utilized computer-based instruction including video modeling, behavioral observation and ratings (having the participant view another person implementing the task and rating the accuracy of the implementation), and active student responding. The training was administered through a learning management system. The initial training resulted in most participants passing most of the tasks. When a task was not passed immediately upon the completion of the initial training, one supplemental module consisting of one additional video model and one additional behavioral observation and rating activity resulted in passing the competency. These results suggest that online asynchronous training may be effective for the initial training of behavior technicians. [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://www.proquest.com.bibliotheek.ehb.be/en-US/products/dissertations/individuals.shtml.]