ABA Therapy Glossary​

An antecedent is the event or situation that happens immediately before a behavior occurs. In ABA therapy, identifying antecedents helps clinicians understand what may be triggering a behavior and how environmental factors influence responses. Recognizing these patterns allows therapists to modify the environment, adjust instructions, or provide supports that prevent challenging behaviors from occurring. Parents can explore how antecedents fit into the larger behavior framework in Understanding the ABC ABA Model.

See Related: Consequence, Behavior Function, Functional Behavior Assessment (FBA), ABC Model

Autism Spectrum Disorder (ASD) is a developmental condition that affects communication, social interaction, and patterns of behavior. The term “spectrum” reflects the wide range of strengths, challenges, and support needs individuals may experience. Many children with ASD benefit from early support that focuses on communication, independence, and daily living skills. Families who are beginning to explore treatment options often start with What Is ABA Therapy? to better understand how behavioral approaches can help.

See Related: Early Intervention, ABA Therapy, Functional Communication Training (FCT)

A BCBA evaluation is a comprehensive assessment conducted by a Board Certified Behavior Analyst to determine a child’s current skills, challenges, and treatment needs before ABA therapy begins. The evaluation typically includes parent interviews, direct observation, standardized assessments, and a Functional Behavior Assessment when challenging behaviors are present. The BCBA then uses this information to develop an individualized treatment plan with specific goals and strategies. A thorough evaluation is the foundation for meaningful progress and helps families know what to expect from therapy. Read the full breakdown in BCBA Evaluation Explained.

See related: Board Certified Behavior Analyst (BCBA), Functional Behavior Assessment (FBA), Behavior Intervention Plan (BIP), Data Collection

Behavior function refers to the reason a behavior occurs or what the child gains from engaging in that behavior. In ABA therapy, clinicians analyze behavior to determine whether it is maintained by attention, escape, access to a tangible item, or sensory input. Understanding the function helps therapists design interventions that teach safer and more effective alternatives. Families can learn more about identifying behavioral patterns through the framework explained in Understanding the ABC ABA Model.

See Related: Functional Behavior Assessment (FBA), Replacement Behavior, Functional Communication Training (FCT), ABC Model

Behavior Skills Training, or BST, is an evidence-based teaching method used to help parents, teachers, and staff learn new skills through four steps: instruction, modeling, rehearsal, and feedback. The trainer first explains the skill, then demonstrates it, has the learner practice it, and provides specific feedback until the skill is mastered. BST is widely used in ABA to train RBTs, support parent training, and teach safety or social skills to learners. Because it relies on practice and feedback rather than just verbal explanation, it leads to lasting behavior change. See how this approach is applied at home in ABA Therapy Parent Training: What to Expect.

See related: Parent Training in ABA, Skill Acquisition, Prompting, Errorless Learning

A BCBA, or Board Certified Behavior Analyst, is a clinician trained to assess behavior, design treatment plans, supervise therapy programs, and monitor progress. In ABA services, the BCBA is responsible for making clinical decisions that are individualized, evidence-based, and ethically guided. They often collaborate with families, therapists, schools, and other providers. Families can learn more about this process in BCBA Evaluation Explained.

See Related: Functional Behavior Assessment (FBA), Behavior Intervention Plan (BIP), Data Collection, ABA Therapy

A consequence is what happens immediately after a behavior occurs. In ABA therapy, consequences play an important role in determining whether a behavior becomes more or less likely in the future. For example, reinforcement can increase a desired behavior, while the removal of reinforcement may decrease an unwanted one. Understanding consequences helps clinicians design effective strategies that encourage positive behaviors and reduce harmful ones. Families can see how consequences interact with other behavioral elements in Understanding the ABC ABA Model.

See Related: Antecedent, Positive Reinforcement, Behavior Function, Differential Reinforcement

Early intervention refers to services and therapies provided to young children who show developmental delays or have been diagnosed with Autism Spectrum Disorder. These services often focus on building communication, social interaction, play skills, and daily living abilities during the early years when the brain is most adaptable. Starting support early can help children build strong developmental foundations and improve long-term outcomes. Parents who are beginning the evaluation process may also find guidance in Top 10 Early Signs of Autism Parents Often Overlook.

See Related: Autism Spectrum Disorder (ASD), ABA Therapy, Skill Acquisition, Parent Training in ABA

Errorless learning is a teaching approach used in ABA therapy where prompts and supports are provided early to help the child respond correctly while learning a new skill. By reducing mistakes during instruction, therapists help learners experience success and avoid frustration. As the child becomes more confident, prompts are gradually faded so the skill can be performed independently. Families interested in how therapists track progress during teaching can learn more in Data Collection in ABA Therapy.

See Related: Prompting, Prompt Fading, Skill Acquisition, Stimulus Control

Extinction in ABA is a behavior strategy in which reinforcement that has maintained a behavior is no longer provided, with the goal of reducing that behavior over time. It is not used in isolation and should only be applied after understanding the function of the behavior. Ethical practice also requires teaching an appropriate replacement behavior at the same time. Families can better understand how behavior patterns are assessed by reading Understanding the ABC ABA Model.

See Related: Behavior Function, Differential Reinforcement, Replacement Behavior, Functional Behavior Assessment (FBA)

Functional Communication Training, or FCT, is an ABA approach that teaches a child a more appropriate way to communicate instead of using challenging behavior. The replacement communication is chosen based on the function of the behavior and may include spoken words, signs, gestures, or communication devices. FCT is commonly used when behavior serves a purpose such as gaining attention, escaping a task, or accessing an item. This kind of intervention is often part of a broader plan like those described in Behavior Intervention Plans.

See Related: Replacement Behavior, Behavior Function, Functional Behavior Assessment (FBA), Positive Reinforcement

In-home ABA therapy is a service model where therapy sessions take place in the child’s home environment rather than a clinic. This setting allows therapists to work on practical daily skills such as communication with family members, play, self-care routines, and transitions between activities. Practicing skills where they naturally occur often improves generalization and makes it easier for caregivers to participate in therapy strategies. Families exploring this option can learn more in Why In-Home ABA Therapy Works.

See Related: Generalization, Parent Training in ABA, Natural Environment Teaching (NET), ABA Therapy

An Individualized Education Program, or IEP, is a legal document developed for a student with disabilities in a U.S. public school that outlines specific learning goals, accommodations, and services. The IEP team — which includes parents, teachers, school staff, and sometimes outside specialists like a BCBA — creates and reviews the plan at least once a year. While an IEP is a school-based tool rather than an ABA service, ABA providers often collaborate with IEP teams to keep goals aligned with what is being taught in therapy. Strong communication between home, school, and clinical providers leads to better outcomes for the child. Get a full overview in What’s an IEP.

See related: Skill Acquisition, Parent Training in ABA, Board Certified Behavior Analyst (BCBA), Generalization

An intraverbal is a type of verbal behavior in which a child responds to another person’s words without directly matching them or pointing to an item in view. Examples include answering questions, filling in familiar phrases, or responding during conversation. Intraverbal skills are important for more advanced language development and back-and-forth social interaction. Families working on real-world communication carryover may also benefit from What Generalization in ABA Really Means.

See Related: Verbal Behavior, Tact, Mand, Generalization

The DSM-5 organizes autism into three levels based on the amount of support an individual requires: Level 1 (requiring support), Level 2 (requiring substantial support), and Level 3 (requiring very substantial support). These levels are descriptive rather than predictive — they describe current needs and can change over time as a child grows and develops skills. ABA therapy is tailored to each child’s unique profile rather than a single level designation, focusing on individual strengths and goals. Understanding levels helps families navigate services, but it does not define what a child can achieve. Learn more in Levels of Autism.

See related: Autism Spectrum Disorder (ASD), Early Intervention, Skill Acquisition, Behavior Function

A mand is a type of verbal behavior in which a child requests something they want or need, such as a snack, toy, break, or help. In ABA therapy, mands are important because they teach communication that is immediately useful in everyday life. Requesting can reduce frustration and help children access reinforcement in a more appropriate way. Families learning how communication goals are introduced can start with What Is ABA Therapy?.

See Related: Verbal Behavior, Functional Communication Training (FCT), Positive Reinforcement, Replacement Behavior

A meltdown is an intense response to overwhelming sensory, emotional, or cognitive demands, and it is very different from a tantrum. Tantrums are often goal-driven and stop when the goal is met, while meltdowns happen when a child has lost the capacity to cope and may continue regardless of consequences. Children with autism often experience meltdowns when their nervous systems become overloaded. ABA strategies focus on identifying triggers, teaching calming and communication skills, and reducing future overload, rather than punishing the meltdown itself. Walk through the stages in Decoding Autistic Meltdowns: The 6 Stages You Need to Know.

See related: Challenging Behavior, Antecedent, Behavior Function, Autism Spectrum Disorder (ASD)

Pairing in ABA is the process of building a positive relationship between the therapist, the environment, and things the child enjoys. The goal is to help the child associate therapy with comfort, trust, and motivation before higher demands are introduced. Strong pairing can improve cooperation, reduce avoidance, and create a better foundation for learning. Families deciding what early sessions may look like can read ABA Therapy at Home Roadmap.

See Related: Positive Reinforcement, Preference Assessment, Skill Acquisition, ABA Therapy

Parent training in ABA is a structured process where caregivers learn strategies to support their child’s development outside therapy sessions. Training may include techniques for reinforcement, prompting, communication support, and responding to challenging behaviors. When families use the same strategies as therapists, children can practice skills consistently in everyday environments, which often improves long-term progress. Caregivers who want to understand how this process works can learn more in ABA Therapy Parent Training: What to Expect.

See Related: In-Home ABA Therapy, Positive Reinforcement, Generalization, Behavior Intervention Plan (BIP)

A preference assessment is a process used in ABA therapy to identify which items, activities, or interactions a child finds most motivating. Therapists use this information to choose effective reinforcers that support learning and engagement. Because preferences can change over time, assessments may be repeated regularly throughout treatment. Parents who want to better understand motivation and reinforcement can also review What Is ABA Therapy?.

See Related: Positive Reinforcement, Pairing, Skill Acquisition, Data Collection

The Premack Principle, sometimes called “grandma’s rule,” is the idea that a high-probability behavior can be used to reinforce a low-probability behavior — for example, “first you finish your math, then you can play outside.” In ABA, this principle helps therapists and parents motivate children to complete less-preferred activities by pairing them with a preferred one. It is a simple, accessible reinforcement strategy that fits naturally into daily routines without tangible rewards. See how this connects to other reinforcement methods in Differential Reinforcement Explained.

See related: Positive Reinforcement, Reinforcer, Differential Reinforcement, Skill Acquisition

In ABA, punishment is a procedure that follows a behavior and decreases the likelihood that the behavior will happen again — it is a technical term, not a moral one. Punishment can take two forms: positive punishment (adding something unpleasant) or negative punishment (removing something preferred, like a privilege). Modern ABA strongly prioritizes reinforcement-based strategies and uses punishment only rarely, with careful ethical review and family consent. The first goal is always to teach replacement behaviors and build skills rather than suppress behavior. Get a clearer view of how consequences shape behavior in Understanding the ABC ABA Model.

See related: Consequence, Reinforcer, Extinction in ABA, Replacement Behavior

A Registered Behavior Technician, or RBT, is a trained paraprofessional who provides direct ABA therapy services under the supervision of a BCBA. RBTs work one-on-one with children to teach skills, support behavior plans, and collect session data. They play an important role in helping treatment goals come to life during day-to-day therapy. For a parent-friendly overview of this role, see What’s an RBT?.

See Related: BCBA, Data Collection, Prompting, Positive Reinforcement, Skill Acquisition

Sensory sensitivities describe how a person responds to input from sights, sounds, smells, textures, tastes, and movement — and many autistic individuals experience these inputs more intensely or differently than neurotypical peers. Some children seek out sensory input, while others find ordinary stimuli overwhelming. Recognizing these patterns matters because what looks like challenging behavior is often a response to sensory overload rather than defiance. ABA programs work alongside families and occupational therapists to design environments and routines that meet a child’s sensory needs. Find practical strategies in Sensory Challenges in Autism: Coping Tips.

See related: Autism Spectrum Disorder (ASD), Antecedent, Challenging Behavior, Behavior Function

Stereotypy refers to repetitive movements, sounds, or actions — often called “stimming” — that an individual uses to regulate their sensory experience or emotions. Common examples include hand-flapping, rocking, vocal sounds, or lining up objects. Stimming is most often associated with autism, though everyone engages in some form of self-regulating behavior. ABA approaches stimming with respect for the individual and only intervenes when the behavior interferes with learning, safety, or daily functioning, never simply to eliminate harmless self-regulation. Read more about the different forms it can take in 7 Types of Autism Stimming.

See related: Behavior Function, Replacement Behavior, Autism Spectrum Disorder (ASD), Challenging Behavior

A tact is a type of verbal behavior in which a child labels or names something they see, hear, feel, or experience. Examples include naming a dog, saying a color, or identifying an emotion. In ABA therapy, tacting helps children expand language beyond requesting so they can comment on and interact with the world around them. Parents exploring communication development may also find ABA Builds Social Skills helpful.

See Related: Verbal Behavior, Mand, Intraverbal, Skill Acquisition

Task analysis is the process of breaking a complex skill into smaller, teachable steps. In ABA therapy, it is commonly used for routines that involve multiple actions, such as brushing teeth, washing hands, getting dressed, or packing a school bag. This helps therapists teach skills in a clear and organized way. Parents looking for real-life routine examples may also find Autism and Daily Routines helpful.

See Related: Chaining, Prompting, Prompt Fading, Skill Acquisition, Maintenance

A transition is the shift from one activity, location, or routine to another — for example, moving from playtime to dinner or from home to school. Transitions are often difficult for children with autism because they disrupt predictability and require flexible thinking. In ABA, transitions are taught explicitly using visual schedules, countdowns, first-then language, and reinforcement for cooperation. Strong transition skills support independence at home, in school, and in the community, and they make daily life calmer for the whole family. Learn how to make daily transitions easier in Autism and Transitions.

See related: Antecedent, Skill Acquisition, Generalization, Prompting

Verbal Behavior is an approach within ABA that focuses on teaching language based on its function, or why communication happens. Rather than looking only at words themselves, verbal behavior examines how communication helps a person request, label, answer, or interact socially. This framework is often used to build meaningful, functional communication skills. Families exploring communication-focused treatment can begin with What Is ABA Therapy? and related skill-building resources across the site.

See Related: Functional Communication Training (FCT), Skill Acquisition, Positive Reinforcement, Generalization