Behavior Assessment (Assessment): RBT Area B Study Guide

Free RBT Practice Test Editorial Team | Updated September 2026

Area B, Behavior Assessment, accounts for 8 of the 75 scored questions on the RBT exam, or 11% of your score. Since January 1, 2026 the exam has followed the RBT Test Content Outline (3rd Edition), which renamed the old Assessment domain and kept it at three tasks, B.1 through B.3, as listed in the official 3rd edition outline published by the Behavior Analyst Certification Board (BACB). This guide explains each task in plain English, gives a session example, and includes two scenario questions per task so you can check yourself before the full practice test.

Assessment is where treatment planning begins. While RBTs do not design or interpret assessments independently, the supervising behavior analyst depends on the RBT to run procedures exactly as written and to record clean, objective data. If you are not yet comfortable with continuous and discontinuous data types, review the Area A guide (Data Collection and Graphing) first, because every assessment task below relies on those skills.

B.1 Conduct preference assessments

Understanding what motivates a client is fundamental to effective ABA. A preference assessment is a structured way to identify items or activities the client is likely to work for. An item the client picks is a potential reinforcer; only its effect on future behavior proves it is one. RBTs run these assessments regularly under the analyst’s plan.

The 3rd edition names three formats you must be able to run:

• Multiple stimulus: several items are laid out at once and the client chooses one. In multiple stimulus without replacement (MSWO), the chosen item is removed and the client chooses again from what remains, producing a ranked list. In multiple stimulus with replacement (MSW), the chosen item goes back and the unchosen items are swapped out.
• Paired stimulus (paired choice): two items are presented at a time, and every item is paired with every other item across trials. The number of times each item is chosen produces a preference hierarchy. Positions must be rotated so the client is not simply picking the item on the left.
• Free operant: the client has free access to an area with several items, and you record how long the client engages with each one. There are no trials and nothing is removed, which makes it the least intrusive option and a good choice for clients who become upset when items are taken away.

Older plans may also use a single stimulus format, presenting one item at a time and recording whether the client approaches it. You can explore external examples and tools for preference assessments alongside this guide.

To run any format accurately, follow the supervisor’s protocol exactly, present items consistently, record selections and refusals precisely, and repeat the assessment over time because preferences change. Common mistakes include relying on assumed preferences, offering items the client has already had plenty of that day, and failing to rotate item positions in paired trials.

Session example: You place five snack items in a row, ask the client to pick one, remove the chosen item, rearrange the remaining four, and repeat until all five have been chosen, recording the order to produce an MSWO ranking.

Check yourself

1. An RBT presents two toys at a time, repeating until every toy has been paired with every other toy, and tallies which toy was chosen in each pair. Which preference assessment format is this?

A. Free operant
B. Multiple stimulus without replacement
C. Paired stimulus
D. Single stimulus

Answer: C. Presenting items two at a time across all possible pairs is the paired stimulus (paired choice) format.

2. A client becomes upset and aggressive whenever a chosen item is taken away. Which format would the supervisor most likely select?

A. Multiple stimulus without replacement
B. Free operant
C. Paired stimulus
D. Momentary time sampling

Answer: B. In a free operant assessment nothing is removed; the RBT simply records how long the client engages with each freely available item.

B.2 Participate in assessments of skill strengths and deficits

Beyond identifying reinforcers, RBTs assist with individualized assessments that map what a client can already do and what needs to be taught. The 3rd edition names three kinds: curriculum-based assessments, which check skills against a structured teaching curriculum; developmental assessments, which compare skills to typical developmental milestones; and social skills assessments, which look at interaction skills such as initiating, turn-taking, and responding to peers.

The behavior analyst selects the tool, decides which sections to administer, and interprets the results. The RBT’s part is to run assigned portions with fidelity. That includes setting up materials and preparing the environment, delivering instructions exactly as written, presenting prompts only when the protocol says to, and recording whether each response was independent, prompted, or absent.

Fidelity matters more here than almost anywhere else. If you rephrase an instruction, offer an extra hint, or repeat a trial the protocol does not allow, the score no longer reflects the client’s actual skill level, and the analyst may write goals that are too easy or too hard. Tips that help: review the assessment instructions before the session, clarify anything unclear with your supervisor in advance, keep a neutral tone and body language so you do not signal the answer, and keep the setting free of distractions.

Pitfalls to avoid include helping too much (overprompting), recording responses subjectively instead of factually, and deviating from the planned sequence without approval. Once assessment is complete, the results feed the teaching programs covered in the Area C guide (Behavior Acquisition).

Session example: Running a section of a curriculum-based assessment on requesting, you present each item exactly as scripted, wait the specified number of seconds, and mark each trial as independent, prompted, or no response, without adding encouragement between trials.

Check yourself

1. During a developmental assessment, the client does not respond to an item. The protocol says to move on after five seconds. The RBT waits, then repeats the instruction with a gesture, and the client responds correctly. How should the trial be scored?

A. Independent correct
B. Correct, because the client eventually responded
C. According to the protocol’s rule for the response as it occurred, and the deviation should be reported to the supervisor
D. The trial should be deleted

Answer: C. The RBT departed from the protocol, so the score must reflect what actually happened and the supervisor must be told, since the added prompt affects the validity of the result.

2. Which of the following is the RBT’s role in a curriculum-based assessment?

A. Selecting which assessment to use
B. Interpreting the results and writing the treatment goals
C. Administering assigned sections as written and recording responses
D. Deciding which skills to skip based on the client’s mood

Answer: C. The analyst selects and interprets; the RBT administers assigned parts with fidelity and collects data.

B.3 Participate in components of functional assessment

A functional assessment seeks to find out why a behavior is occurring. Common functions include attention from others, escape from demands, access to tangible items or activities, and automatic (sensory) reinforcement. The 3rd edition names two components RBTs participate in: descriptive assessment and functional analysis.

Descriptive assessment means observing the behavior in natural settings and recording what surrounds it without changing anything. The main tool is ABC data: the Antecedent (what happened immediately before), the Behavior (exactly what the client did), and the Consequence (what happened immediately after). For example, a teacher announces circle time (A), the client throws a toy (B), and the client is removed from the group (C). Across many sessions, a pattern like that suggests escape may be maintaining the behavior, but the pattern is suggestive, not proof. Scatterplots that mark the time of day a behavior occurs are another descriptive tool. You can read more about ABC data collection.

Functional analysis (FA) goes a step further. The behavior analyst arranges test conditions, such as attention, demand, alone, and play, and systematically presents and withholds consequences to see which condition produces the behavior. Because an FA deliberately sets up situations that may evoke problem behavior, it is designed and led by the analyst, and the RBT may only run conditions after being trained and while being supervised.

In both, the RBT’s responsibilities are the same: collect accurate, objective data without assumptions, observe without interrupting unless safety requires it, follow any structured procedures the supervisor has written, and report unusual patterns immediately. Avoid vague language such as “client got upset,” avoid recording only part of the ABC sequence, and never label the function yourself. Determining function is the analyst’s job; your job is to give the analyst reliable data.

Session example: Every time the target behavior occurs during a home session, you write the exact antecedent, a description of the behavior, and what happened in the ten seconds afterward, then hand the ABC sheet to your supervisor without adding a guess about the function.

Check yourself

1. An RBT records the following for each occurrence of screaming: what happened right before, what the screaming looked like, and what people did immediately afterward. Which component of functional assessment is this?

A. Functional analysis
B. Descriptive assessment
C. Preference assessment
D. Curriculum-based assessment

Answer: B. Recording antecedents, behavior, and consequences during natural observation without manipulating conditions is descriptive assessment.

2. A supervisor asks an RBT to run an attention condition in which the RBT ignores the client until the target behavior occurs and then briefly attends to it. Which statement is correct?

A. This is a descriptive assessment because the RBT is collecting data
B. The RBT should refuse because RBTs never participate in functional analyses
C. This is a functional analysis condition, and the RBT may run it after training and under the supervisor’s direct oversight
D. The RBT should decide the function once the condition ends

Answer: C. Systematically arranging consequences is a functional analysis, which RBTs can help run when trained and supervised, while interpretation stays with the analyst.

How this area is tested

Area B questions are short scenarios that test whether you can name the right assessment format, recognize the boundary between the RBT’s role and the analyst’s role, and record objectively. Expect questions like “Which preference assessment format is described?”, “What should the RBT do when the client does not respond?”, and “Which of these is an ABC entry written correctly?”

Common traps:

• Preference versus reinforcer. A chosen item is a potential reinforcer; only a later increase in behavior confirms it.
• MSWO versus MSW. Without replacement removes the chosen item and yields a ranking; with replacement returns it.
• Paired stimulus versus multiple stimulus. Two items at a time versus an array of items.
• Free operant versus trial-based. Free operant measures engagement time with nothing removed.
• Descriptive assessment versus functional analysis. Observing under natural conditions versus deliberately arranging conditions.
• Role boundaries. Any option in which the RBT selects the assessment, interprets results, or names the function is wrong.
• Wording. ABC and session note options containing words like upset, wanted, or refused are inferences, not observations.

Practice this area

Take the Area B practice test to work through scenario questions on preference, skill, and functional assessments. Unfamiliar terms are defined in the RBT exam glossary. When you are ready to move on, the skills identified here are taught using the procedures in the Area C guide (Behavior Acquisition).

Frequently asked questions

How many exam questions come from Area B?
8 of the 75 scored questions, or 11%. It is the smallest area on the 3rd edition exam, but the concepts also appear inside Area C and Area D questions.

What changed from the 2nd edition Assessment domain?
The name changed to Behavior Assessment and the three tasks were reworded. B.1 now explicitly names multiple stimulus, paired stimulus, and free operant formats; B.2 names curriculum-based, developmental, and social skills assessments; B.3 names descriptive assessment and functional analysis as the components RBTs participate in.

Can an RBT run a functional analysis?
An RBT may run FA conditions only after being trained on them and while under the direct supervision of the behavior analyst who designed the analysis. The RBT never decides what the function is.

How often should preference assessments be repeated?
As often as the plan says, and any time the client stops responding to a reinforcer. Preferences shift with time of day, recent access, and novelty, so many teams run a brief assessment at the start of each session.

What does an ABC entry need to include?
The exact antecedent (what was said or done immediately before), an observable description of the behavior, and the consequence (what happened immediately after), all written without guesses about feelings or intent.

What is the difference between a preference assessment and a reinforcer assessment?
A preference assessment identifies what the client chooses. A reinforcer assessment tests whether delivering that item actually increases a behavior. RBTs typically run the first and collect data for the second.