An evaluation of the effects of access duration on preference assessment outcomes.

The team compared two ways to run a preference assessment.

Kids got either long play time with each item or short snippets.

They wanted to see if longer access made the final ranking more stable.

Long-access trials gave steadier preference lists from round to round.

The top item stayed the same in both short and long, but the order below it wobbled less after long access.

Melanson et al. (2023) later tracked MSWO rounds and saw only 60% stability within the same test. Their shorter 30-second picks match the short-access wobble seen here.

Wanchisen et al. (1989) showed that even a quick presession choice cut problem behavior. The new study adds that if you want the whole list to stay put, stretch the sampling time.

Reid et al. (2003) asked how many 5-minute watch sessions you need. Both papers say the same thing: a little more time up front saves guesswork later.

Stable hierarchies mean you can trust tomorrow’s reinforcer order without retesting. If you run a 30-second MSWO and the child’s top three keep shifting, rerun it with longer access or add extra time to the first round. You will spend fewer sessions on reassessment and more on teaching.