What does a multiple-stimulus without replacement (MSWO) assessment entail?

• A. Present one item at a time and remove if selected.
• B. Present several items; the person selects items in order of preference, removing chosen items.
• C. Present items with replacement and note frequency of selection.
• D. Offer a forced-choice pairings with replacement.

Answer: (B)

MSWO is about quickly ranking several potential reinforcers in one session by having the person choose among multiple items and removing each chosen item so it can’t be chosen again. The participant makes selections in order of preference, and after an item is chosen, it’s taken away; you repeat with the remaining items until all have been ranked from most to least preferred. This “without replacement” feature is what reveals a clear hierarchy rather than repeat selections of the same item.

The best description matches presenting several items at once, letting the person indicate their order of preference, and removing chosen items after each selection. Other descriptions describe different procedures (one-at-a-time presentation, or presenting with replacement, or forced-choice pairings), which don’t capture the same ranking process.