One of the most common questions families ask before starting ABA therapy is: what will my child actually be doing for those hours each day? It is a reasonable question. ABA therapy is not a single uniform activity — it encompasses a range of structured and naturalistic teaching approaches that can look quite different depending on the child's age, goals, and current skill level.
Understanding what happens during a session — and why — helps parents become more effective partners in the therapy process. It also equips you to evaluate whether the sessions your child is receiving meet the standard of quality ABA practice.
Before the session begins: preparation and review
A quality ABA session does not begin when the therapist walks through the door — it begins with preparation. The RBT (Registered Behavior Technician) who delivers your child's session should review the session notes from the previous session, check the current mastery status of each target in your child's program, confirm any updates or instructions left by the supervising BCBA, and prepare the materials needed for today's targets.
This preparation step is brief — typically five to ten minutes — but it is a meaningful quality signal. An RBT who arrives and immediately starts working without reviewing prior session data is not delivering the individualized, data-driven therapy your child is supposed to receive. Ask your BCBA how session-to-session continuity is maintained and how RBTs are trained on the specific programs in your child's treatment plan.
The two core teaching formats: DTT and NET
Most ABA sessions blend two primary instructional approaches: Discrete Trial Training (DTT) and Natural Environment Teaching (NET). Understanding the difference between them helps you interpret what you observe during sessions.
DTT is a structured, table-based or sit-down teaching format in which the therapist presents a specific learning opportunity (called a discriminative stimulus), waits for the child's response, and provides feedback (reinforcement for correct responses, error correction for incorrect ones). DTT is highly efficient for teaching discrete skills — identifying colors, matching objects, following one-step instructions, or labeling pictures — because it allows for many concentrated learning opportunities in a short period. A skilled RBT can run 100 or more trials in a 30-minute DTT block.
NET takes the opposite approach: teaching skills in natural, play-based contexts using the child's own motivation as the instructional engine. Rather than presenting a flashcard of a ball and asking "What is this?", the therapist might incorporate labeling during an actual play activity — rolling the ball back and forth and providing a natural opportunity for the child to request or label it. NET is critical for generalization: ensuring skills learned at a table transfer to real-world contexts where the child will actually need to use them. Quality ABA programs use both approaches strategically, allocating more DTT to skills that require massed practice and more NET to skills that require real-world application.
How data collection works during sessions
Data collection is what distinguishes ABA from other therapeutic approaches. During every session, the RBT records the child's performance on each target skill — typically using a tablet or paper data sheet. For trial-based targets, data is recorded as correct, incorrect, or prompted for each individual trial. For behavior targets, data may be recorded as frequency (how many times a behavior occurred), duration (how long it lasted), or interval (whether it occurred during specific time windows).
This real-time data is reviewed by the supervising BCBA, typically weekly or biweekly, to make clinical decisions about the program. If a child's data shows that a target skill has been mastered — meeting the pre-specified criteria, such as 80% correct across three consecutive sessions — the BCBA advances the program to the next skill in the sequence. If data shows a skill is not progressing as expected, the BCBA modifies the teaching procedure, adjusts the prompt level, or investigates whether prerequisite skills are missing.
As a parent, you have the right to see your child's data. Ask your BCBA to walk you through the data system at least once so you understand what is being measured, what the mastery criteria are for each target, and how to read the graphs. Understanding your child's data turns you from a passive observer into an active participant in clinical decision-making.
Reinforcement: the engine of the program
Every ABA session is built around reinforcement — the process of strengthening behaviors by following them with consequences the child finds motivating. Before a new client begins therapy, the BCBA conducts a preference assessment to identify what is genuinely motivating to that specific child: particular toys, activities, foods, social praise, sensory experiences, or combinations of these.
Effective reinforcement in ABA is individualized, contingent, and immediate. It is individualized because what motivates one child leaves another indifferent — generic praise ("Good job!") has limited reinforcement value for many children with autism. It is contingent because it is delivered specifically following the target behavior, not randomly. It is immediate because the closer in time the reinforcement follows the behavior, the clearer the association between the two.
One concern parents sometimes raise is whether ABA relies too heavily on food or toy reinforcers and whether the child will only perform skills when rewards are present. This is addressed in quality ABA programs through a process called reinforcer thinning and natural reinforcement — gradually shifting from artificial reinforcers to the natural consequences that exist in real-world environments, so that skills maintain without requiring continuous external reward.
What to observe during your child's sessions
Most ABA providers encourage parents to observe sessions, at least periodically. If you are observing, here is what a high-quality session looks like: the RBT is engaged and animated, using genuine enthusiasm rather than mechanical praise; the child is primarily successful (a well-designed program keeps error rates low by adjusting difficulty to the child's current level); transitions between activities are smooth; the RBT is recording data consistently throughout; the session ends with a motivating activity to leave the child in a positive state.
Concerning signs include an RBT who is distracted by their phone during non-data-collection periods, a child who is consistently crying, distressed, or refusing to engage, an RBT who provides the same generic verbal praise regardless of the child's response, sessions that look identical week after week without any visible progression in difficulty, and an RBT who cannot explain what they are working on or why.
If you observe something that concerns you, bring it to your BCBA directly. A quality clinical team welcomes parent feedback and sees it as essential information for program quality. If your concerns are dismissed or minimized, escalate. Your observations of your child's wellbeing and engagement during therapy are clinically valid data.
