https://www.thoughtco.com/operational-definition-of-behavior-3110867
https://iris.peabody.vanderbilt.edu/module/beh2/cresource/q2/p08/#content
http://www.ideapartnership.org/documents/ASD-Collection/asd-dg_Brief_FBA.pdf
https://journals.sagepub.com/doi/pdf/10.1177/1063426615623769