Comparing descriptive, experimental and informant-based assessments of problem behaviors.

The team ran three kinds of assessments on four children with developmental delay.

They compared parent interviews, 30-minute room observations, and short experimental functional analyses.

Each child was watched in all three ways to see which method spotted the real reason for the problem behavior.

Parent interviews matched the experimental FA in three of four kids.

Room observations matched in only one of four kids.

The observations kept saying the child acted up when attention was scarce, even when the FA showed escape or tangible functions.

Valluripalli Soorya et al. (2025) shows that when kids have severe ID, even standard autism tools can fail.

That extends our 2005 warning: if the child can’t talk or the parent can’t report well, lean on brief experimental tests, not on watching alone.

Matson et al. (2013) later showed that running the FA in a fixed order (ignore, attention, play, demand) gives clearer curves faster.

So combine the lessons: do a quick fixed-sequence FA instead of hoping long observation will tell you the function.

Next time you feel pressed for time, skip the hour-long hallway watch.

Ask the caregiver five targeted questions, then run a 15-minute fixed-order FA.

You will leave with a truer function and a treatment plan you can trust.