Common Mistakes New ABA Therapists Make and How to Avoid Them
Every new ABA therapist makes mistakes. That is not a criticism. It is the reality of learning a clinical skill. The question is not whether mistakes will happen but whether they are caught early, corrected, and learned from. That is what supervision exists for.
This guide names the most common mistakes that appear in new therapists' early practice and explains specifically what to do instead. Reading it before you start working, rather than after the mistakes have already shaped your habits, is one of the most useful things you can do.
Treating Data Collection as Secondary to the Session
Data collection is not something that happens alongside the session. It is the clinical mechanism that makes ABA different from any other supportive interaction with a child. Without accurate data, there is no basis for clinical decisions about whether a programme is working, whether a target has been mastered, or whether a strategy needs to be adjusted.
New therapists sometimes deprioritise data collection when a session is going well, or skip recording individual trial outcomes because the session feels too fluid to interrupt. The result is a data record that reflects what the therapist remembers rather than what actually happened. Memory is not a reliable clinical tool.
What to do instead: practise data collection in your training before you are in a real session. Get comfortable with the recording system until it becomes part of the natural rhythm of the session rather than an interruption to it. If you finish a session and realise you have missed data points, note this honestly in your session notes and raise it with your supervisor.
Improvising When a Strategy Is Not Working
When something in a session is not going as planned, the instinct of many new therapists is to try something different. To adjust the approach, try a new strategy, or modify the prompt hierarchy on the fly.
This instinct is clinically problematic. Strategies in an ABA programme are selected by the supervising clinician on the basis of the functional assessment and the clinical evidence. Changing them mid-session, without clinical authorisation, means the data you collect no longer reflects the programme that was designed. And it means the child is receiving an inconsistent intervention, which undermines the very mechanism that makes ABA effective.
What to do instead: implement the programme as designed, document carefully what you observe, and bring your questions and concerns to supervision. If something is clearly not working or seems to be causing distress, note it in your session records and flag it immediately to your supervisor. Do not wait for the next scheduled supervision meeting if it feels urgent.
Reinforcing the Wrong Behaviour
This mistake is more common than most new therapists expect because it is subtle. The reinforcer is delivered with good intentions, immediately after a correct response, but the behaviour that was actually reinforced was not the target behaviour.
A child completes a trial correctly, then immediately reaches for a toy. The therapist delivers the reinforcer while the child is reaching. The reinforcer follows the reaching, not the trial completion. Reaching is what has been reinforced.
Or a child begins to tantrum and the therapist, seeking to de-escalate, offers a reinforcer. The tantrum is now what has been reinforced.
What to do instead: be very precise about the timing of reinforcement delivery. The reinforcer must immediately follow the exact behaviour you are targeting. In the early stages of practice, slow down deliberately to make sure you know what behaviour you are about to reinforce before you deliver the reinforcer.
Over-prompting and Creating Prompt Dependence
A child who is always prompted to respond correctly never has the experience of responding independently. Over-prompting, which means consistently providing more support than the child actually needs, prevents the development of independent responding.
New therapists often over-prompt because they want the child to experience success and because watching a child struggle feels uncomfortable. The solution seems obvious: help them. But help that prevents the child from doing something themselves is not help in the clinical sense.
What to do instead: use the least intrusive prompt that produces a correct response. If you are not sure what level of prompt the child needs, start with the least intrusive option and work up if the child does not respond. Build a systematic fading plan into every programme that requires prompting, and monitor your data to check that prompting levels are reducing over time as the skill develops.
Not Using Supervision Actively
Supervision is the most valuable resource available to a new ABA therapist. It is the mechanism through which clinical errors are caught and corrected, skills are developed, and confidence is built on a genuinely solid foundation.
Some new therapists treat supervision as an evaluation to be passed rather than a learning resource to be used. They present their sessions in the best possible light, avoid raising concerns or mistakes, and miss the opportunity to develop the clinical depth that only comes from honest professional dialogue.
What to do instead: use supervision as the resource it is. Bring the sessions that went badly as well as the ones that went well. Ask the questions you are not sure about. Share your uncertainty honestly. A supervising clinician who is aware of where you are struggling can help you. One who only sees your best performance cannot.
How NeuroCore Prepares New Therapists
NeuroCore's live online IBT and ABAT training is designed to build the clinical habits that prevent these mistakes from developing in the first place. Through live interaction with experienced clinicians and real case discussion, our graduates develop the judgment and the self-awareness that characterise genuinely competent early-career practitioners.
Visit our IBT and ABAT Training page to learn more or enrol now and find out when our next live sessions are scheduled.
