RBT guideCore RBT Concepts
RBT Preference Assessment: Finding Likely Reinforcers
A preference assessment identifies items or activities a client is likely to work for. It is not a functional analysis and not a diagnosis. Implement the method the plan names.
Short answer
A preference assessment identifies items or activities a client approaches or selects, which may function as reinforcers if they increase behavior when delivered after a response. It is a Domain B (Behavior Assessment) technician task. Implement the written method—often single-stimulus, paired-stimulus, or multiple-stimulus without replacement (MSWO). It is not a functional analysis, not a diagnosis, and not permission to change the behavior plan.
Likely reinforcers, not a function of behavior
A preference assessment identifies items or activities a client is likely to work for. It is not a diagnosis and it is not a functional analysis. Practice naming the assessment the stem described before you invent a new array. The parent map is behavior assessment. ABC and functions live on ABC data. Preference answers “what might the client work to get.” Function answers “why does this behavior keep occurring.”
A preferred item is a candidate reinforcer. It becomes a reinforcer only if delivering it after a response increases that response. See reinforcement versus punishment.
Methods the items usually describe
Single-stimulus (successive choice): present one item at a time and record approach or engagement.
Paired-stimulus (forced choice): present two items; record which is selected. Repeat pairs.
Multiple-stimulus without replacement (MSWO): present an array, record the first selection, remove it, represent the rest, and build a ranking.
Free-operant / duration: observe what the client contacts in an open setting when the plan uses that method.
The written protocol controls duration, how you prompt a choice, and whether you allow replacement. Do not switch from MSWO to “just hand them the iPad” because it is faster.
Original teaching sketch: An MSWO ranking of bubbles, then music, then a puzzle means bubbles were selected first from the full array. It does not prove bubbles will increase manding until you use them as a consequence and the data move.
These sketches are original. They are not BACB exam items.
When MSWO and paired-stimulus still swap, use stems that only change how many items appear at once.
Role limits
Do not diagnose. Do not replace a functional assessment. Do not add food if the plan forbids it. Record what the data sheet asks. Ask the supervisor if the array is stale because preference shifted—common, and a reason to reassess rather than to scold the client.
Token economies often use preference assessment to pick backup reinforcers. Acquisition then uses those items in teaching.
The what-to-study guide places assessment as Domain B.
If rankings and functions keep mixing, keep a preference-only block.
A high-ranking item that never follows the target response is a toy, not a procedure.
Then drop preference items into mixed Domain B practice so they still sit beside ABC stems without collapsing into them.
Trust the source
Official sources
Exam policies can change. Use these primary sources for the most current details.