• This chapter is an update to a previously published chapter on the history of functional analysis.
• Developments in the use of functional analyses are described across methodologies, populations, behaviors, settings and individuals, idiosyncratic variables, and duration.
• Future directions for the field are discussed.
Nohelty, K., Burns, C., & Dixon, D. (2021). A brief history of functional analysis: An update. In J. L. Matson (Ed.), Functional assessment for challenging behaviors and mental health disorders (pp. 25-46). New York, NY: Springer. https://doi.org/10.1007/978-3-030-66270-7_2