Functional analysis of problem behavior: A 40‐year review

Melanson and colleagues looked at every functional-analysis study published from 2012 to 2022.

They found 326 papers that tested 1,333 learners with autism, developmental delay, or intellectual disability.

The team coded where, how, and how long each FA was run to map real-world trends.

Sessions are getting shorter: brief and trial-based formats now outnumber long analog sessions.

More families receive FA in outpatient clinics instead of hospitals.

Tangible conditions (toys, food) are tested more often, and autistic learners make up a bigger share of cases.

Colombo et al. (2024) narrows the same 2020s data to adults and finds only 28 studies—proof the adult gap still exists.

Nesselrode et al. (2022) zooms in on public schools and mirrors the brief-format trend Melanson saw across all settings.

Henry et al. (2021) and Perez et al. (2015) supply the actual brief-to-extended protocols that are driving the shorter-session pattern.

Suchowierska-Stephany (2023) covers 85 years and agrees FA works, but adds that newer tools like IISCA may speed the process even more.

You can stop defaulting to 15-minute analog sessions. Try a 5-minute trial-based FA first; it often gives the same answer in half the time.

If you work in clinics or homes, the data say you are now the norm—build caregiver coaching into your workflow just like Guest et al. (2013) did.

Keep an eye on tangible conditions: many teams still skip them, yet Melanson shows they are increasingly relevant.