Concepts and Principles

14% of the BCBA exam · blueprint Test Content Outline 6th ed. (since 2025)

Short answer

Domain B is the second-largest area at 24 of 175 scored questions (14%). It covers behavior, response and response class; respondent and operant conditioning; reinforcement and punishment (positive and negative, unconditioned and conditioned); motivating operations and their value-altering and behavior-altering effects; stimulus control, discrimination and generalization; schedules of reinforcement; the verbal operants; and derived stimulus relations.

Why it matters on this exam

Domain B is the vocabulary every other domain's questions are written in. Weak B makes F, G and H harder even when you know the procedures.

Key concepts

Response class: topographically different responses with the same effect on the environment.
Respondent vs operant: elicited by an antecedent stimulus vs selected by consequences.
Reinforcement/punishment matrix: positive = stimulus added, negative = stimulus removed; reinforcement increases future frequency, punishment decreases it. Defined by effect, never by intent.
Motivating operations: an EO raises reinforcer value and evokes behavior; an AO lowers value and abates it. Distinguish from the SD, which signals availability.
Stimulus control: SD signals reinforcement is available, S-delta that it is not; discrimination training establishes control, generalization spreads it.
Schedules: FR, VR, FI, VI with their characteristic patterns (post-reinforcement pause on FR/FI, steady high rate on VR, scalloping on FI).
Verbal operants: mand (under MO control, specifies its reinforcer), tact, echoic, intraverbal, textual, transcription; listener responding is related but is listener, not speaker, behavior.
Derived relations: stimulus equivalence through reflexivity, symmetry, transitivity.

Common mistakes

Labelling "took the headphones away and the behavior decreased" as negative reinforcement. Removal plus decrease is negative punishment.
Treating a deprivation state as an SD rather than an EO.

Worked example

A child says "cookie" only when hungry and cookies are visible. Hunger is the EO, the visible cookie is the SD, and the response is a mand because it is under EO control and specifies its reinforcer.

Original practice questions

Concepts and PrinciplesDifficulty 3/5

A learner has had unrestricted access to a tablet all morning and no longer works to earn tablet time. What has occurred?

AThe tablet has become an S-delta signalling that responding will not be reinforced
BExtinction has weakened the mand because the reinforcer no longer follows it
CAn abolishing operation has reduced the reinforcing value of the tablet
DSatiation has turned the tablet into a punisher that now suppresses responding

Show answer and rationale

Correct: C. Free access is an abolishing operation: it decreases the momentary value of the tablet as a reinforcer and abates behavior previously reinforced by it. The tablet has not become aversive, and no discriminative or extinction contingency has been described.

D — Reduced value is not the same as becoming a punisher.
A — An S-delta signals that reinforcement is unavailable for a response; nothing about availability changed.
B — Extinction means the reinforcer no longer follows the response, which is not what happened.

Concepts and PrinciplesDifficulty 2/5

A child who is thirsty says 'water' and is given water. Which verbal operant is this?

AIntraverbal
BEchoic
CTact
DMand

Show answer and rationale

Correct: D. A mand is evoked by a motivating operation and specifies its own reinforcer. Thirst is the EO and water is the specified reinforcer.

C — A tact is evoked by a nonverbal stimulus and reinforced by generalized reinforcement.
A — An intraverbal is evoked by verbal behavior without point-to-point correspondence.
B — An echoic has point-to-point correspondence and formal similarity with a verbal model.

Concepts and PrinciplesDifficulty 3/5

Which schedule of reinforcement typically produces a high, steady rate of responding with little post-reinforcement pausing?

AVariable ratio
BVariable interval
CFixed ratio
DFixed interval

Show answer and rationale

Correct: A. Variable-ratio schedules reinforce after an unpredictable number of responses, producing high steady rates with minimal pausing. Fixed ratio and fixed interval both produce post-reinforcement pauses, and variable interval produces a moderate steady rate.

C — Fixed ratio produces a high rate but with a post-reinforcement pause.
D — Fixed interval produces a scalloped pattern.
B — Variable interval produces a moderate, steady rate.

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Primary references

BCBA Test Content Outline (6th ed.), in effect since 2025 — Behavior Analyst Certification Board (BACB) · primary · retrieved 2026-09-22, verified 2026-09-22

Last reviewed: 2026-10-18Next review by: 2026-12-17Reviewed by: Openverse editorial team, Authoring and fact verificationHow we verify facts