Assessment of the convergent validity of the Questions About Behavioral Function scale with analogue functional analysis and the Motivation Assessment Scale.

Researchers compared three ways to find why adults with intellectual disability hit, bite, or scream. They ran the Questions About Behavioral Function scale, the Motivation Assessment Scale, and full analogue functional analyses on the same 19 clients.

Each tool gave a guess about the reason for the behavior. The team then checked how well the two checklists matched the gold-standard analogue results.

The QABF matched the analogue FA 74 % of the time. The MAS only matched 42 % of the time. When behavior was rare, the QABF still gave a clear lead; the analogue sessions never even saw the behavior.

The QABF was also faster. Staff filled it out in 10 minutes. No extra rooms, cameras, or sessions were needed.

Matson et al. (1999) got the same good news two years earlier. They used QABF results to pick treatments for 398 clients. Function-based plans beat standard care, so the checklist does not just correlate—it works in real life.

Gutierrez et al. (1998) warns that the MAS has shaky reliability. Their data fit the current study: MAS was the weakest link again. The two papers together bury the MAS, not contradict, but pile on evidence.

Rajaraman et al. (2022) and Gerow et al. (2020) push the idea further. Both show ultra-brief or parent-run FAs can succeed when behavior is hard to evoke. The QABF opened the door for these even simpler tools.

If a client engages in severe but infrequent aggression, you no longer need to block off a room and hope the behavior shows up. Start with the free QABF checklist. It gives a solid hypothesis in minutes and keeps your treatment timeline moving. Pair the result with a brief experimental test if you want extra certainty, but you can begin teaching replacement skills today instead of waiting for that elusive outburst.