Reinforcer assessment
A reinforcer assessment tests whether a stimulus actually works as a reinforcer by delivering it contingent on a response and measuring whether that response increases.
A preference assessment shows what a person chooses, but only a reinforcer assessment shows whether an item increases behavior when it follows that behavior. In a typical setup, the supervisor picks a simple response, such as placing a block in a bucket or pressing a button, and compares responding when the item is delivered contingent on the response with responding when it is not (or when a different item is used).
Variations include comparing two items available at the same time to see which the client works for, or gradually raising the number of responses required for each delivery (a progressive-ratio arrangement) to see how much work the client will do for an item before stopping. An item that sustains more responding is considered a stronger reinforcer under those conditions.
Reinforcer assessments are designed by the supervisor; RBTs may conduct sessions and record data. The results matter because teaching depends on effective reinforcers, and a preferred item does not always function as one. Even after an assessment, the effect of an item can change with satiation, deprivation and the client's routine, so ongoing observation of how the client responds during sessions remains important.
Example and non-example
| Example | Following the supervisor's protocol, an RBT gives a client a sticker each time they sort a coin into a bank, and records that sorting rises from 3 per minute with no stickers to 9 per minute with stickers. |
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| Non-example | Asking a client to point to their favorite of three stickers is a preference assessment, because it measures choice rather than an effect on behavior. |
Don't confuse it with
| Preference assessment | A preference assessment identifies what the client chooses; a reinforcer assessment tests whether the item increases behavior when delivered contingently. |
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| Reinforcement | Reinforcement is the process itself; a reinforcer assessment is a procedure to test whether a particular item produces it. |
Test yourself
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Question 1A client chooses a toy car first in every preference assessment. What does this result show?
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B: The car is a likely reinforcer, but this has not been tested. Preference assessments show what a client chooses. Highly preferred items often function as reinforcers, but only a reinforcer assessment, or data from teaching, shows whether delivering the item increases behavior.
- A: Using one item for everything invites satiation and ignores other preferred items.
- C: Preference predicts reinforcement but does not guarantee it for every behavior.
- D: Preferences change over time, so assessments are repeated.
Task B.1 · 40-hour curriculum section D
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Question 2Which procedure tests whether a preferred item actually increases a behavior when it is delivered contingent on that behavior?
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B: Reinforcer assessment. A reinforcer assessment delivers the item contingent on a response and checks whether the response increases. Preference assessments identify likely reinforcers; reinforcer assessments test them.
- A: Asking others about preferences does not test whether an item reinforces behavior.
- C: A free-operant assessment measures engagement time, not reinforcement effects.
- D: A paired-stimulus assessment measures choice, not the effect of contingent delivery.
Task B.1 · 40-hour curriculum section D
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Question 3A supervisor's MSWO array holds four snacks and four toys. Across administrations, the client selects all four snacks before any toy. Which statement is accurate?
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D: Snacks often rank above leisure items when both share one array. When foods and leisure items are assessed together, foods are often chosen first, so toys can rank low even if they would work as reinforcers on their own. For this reason supervisors often assess edible and leisure items in separate arrays.
- A: Ranking below snacks shows relative preference; the toys may still work as reinforcers when snacks are not competing with them.
- B: Satiation on snacks would make them less likely, not more likely, to be chosen first.
- C: Choosing snacks first is a valid result that reflects relative preference within this array.
Task B.1 · 40-hour curriculum section D
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On the RBT exam
This term belongs to task B.1 Preference assessments in content area B, Behavior Assessment, which is 8 of the 75 scored questions.