When working in any setting as a practitioner claiming to be practicing ABA or implementing the principles of ABA, it is a requirement that data be collected. As Jose Martinez-Diaz warns, "If you are not taking data, you are not doing ABA." At minimum, data collection is vital in order to measure progress and ensure fidelity to the treatment plan.
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Video lecture on Behavioral Objectives given by Robbie El Fattal at Texas A&M.