When It Fits
MSWO fits when the client can scan several visible items and choose from an array, and the practitioner wants a time-efficient direct preference assessment.
Multiple Stimulus without Replacement Preference Assessment
Multiple Stimulus without Replacement Preference Assessment is an ABA direct preference assessment for practitioners. It helps a practitioner present several visible candidate items, record client selections, remove selected items, and produce a ranked preference hierarchy for likely reinforcer candidates.
Start a sample MSWO session with fictional items.
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Tool guide
Learn more about this tool
Use this background section to understand when the tool fits, how practitioners use it, and what to consider before sharing it with clients.
Result Boundary
The hierarchy identifies observed preference patterns and likely reinforcer candidates. It does not prove reinforcement effects.
Does the selected item stay in the array?
No. In MSWO, the selected item is removed from the remaining rounds in that session.
Is there a client-facing digital form?
No. The client participates in the live item-choice interaction while the practitioner records choices.
Can a stopped session still be reviewed?
Yes. A stopped session remains partial direct-choice evidence with the stopping point clearly marked.