Assessing children's physical activity in their homes: the observational system for recording physical activity in children-home.

Matson et al. (2009) built a simple watch-and-code tool called OSRAC-H. It lets you record how active kids are while they move around their own homes.

Two observers sat in the home and tallied activity types and intensity. The team checked that both observers agreed on what they saw.

The codes reached good inter-observer reliability. That means the tool is ready for BCBAs to use right away.

You can now measure physical activity in the exact place where most kids spend the most time.

Griffith et al. (2012) also built an observation system, but they watched preschoolers on playgrounds. Their codes worked well too, showing the idea is solid in both indoor and outdoor spots.

Miltenberger et al. (2013) used small wrist accelerometers instead of human eyes. They found kids with autism logged the same moderate-to-vigorous minutes as peers, but parents said their kids did fewer kinds of activities. OSRAC-H adds the "why" — direct notes on what the child actually does at home.

Pan (2008) saw lower recess MVPA in kids with ASD versus peers. That recess gap might not show up at home; OSRAC-H lets you check each setting separately instead of guessing.

If you write plans for increasing movement, you need a quick, cheap way to take before-and-after data in the natural home. OSRAC-H gives you reliable numbers without buying wearables or trusting parent diaries. Pair it with accelerometry if you want both objective counts and rich detail on what the movement looks like.