In ABA (Applied Behavior Analysis), ERR typically refers to “error” or error-related procedures, specifically error correction and errorless learning. These are two core teaching strategies that determine how a therapist handles mistakes during learning trials. Error correction is a structured sequence for responding after a learner makes a mistake, while errorless learning is a prevention-first approach designed to keep errors from happening at all.
Errorless Learning: Preventing Mistakes Before They Happen
Errorless learning is a teaching method that uses prompts to guide a learner to the correct response every single time. Instead of letting someone try, fail, and then be corrected, the therapist provides enough support upfront that the learner simply doesn’t get the chance to make an error. The goal is for the learner to practice the right answer so many times that it becomes automatic, at which point the prompts are gradually removed.
This approach works on a most-to-least prompting hierarchy. A therapist starts with the highest level of support needed to guarantee success. That might mean physically guiding a child’s hand to the correct picture card, or saying the answer out loud for the child to repeat. After a set number of correct responses (often three consecutive trials), the therapist dials back the prompt slightly. Over time, the learner moves from full physical guidance to a gentle touch, then to a gesture, then to no prompt at all. Each step only happens once the learner has shown they’re ready.
The logic behind errorless learning is that repeated errors can create frustration, reduce motivation, and sometimes cause a learner to “practice” the wrong response until it becomes a habit. By keeping the experience positive from the start, the learner builds confidence and associates the correct response with the natural cue rather than with the prompt itself. Positive reinforcement after each correct response strengthens that association further.
Error Correction: What Happens After a Mistake
Error correction is a structured procedure that kicks in when a learner gives an incorrect response during a teaching trial. Rather than simply saying “no” or moving on, the therapist follows a specific sequence to help the learner recover and practice the right answer. A common version involves several steps:
- Identify the error. The therapist catches the mistake immediately, marks the trial as incorrect, and withholds reinforcement. No reward is given for a wrong answer.
- Transfer trial. The therapist re-presents the same instruction, this time with a prompt chosen to prevent the same error. The prompt should be the least intrusive one that will still ensure success. A correct response here earns some reinforcement, though less than a fully independent answer would.
- Practice. The learner gets up to three additional chances to practice the correct response, keeping the session engaging without collecting formal data on these trials.
- Distractor trial. The therapist inserts something easy and unrelated, like “touch your head,” that the learner can succeed at. This resets their momentum and prevents the feeling of being drilled on a single hard task.
- New opportunity. The original instruction is given again without a prompt. If the learner responds correctly this time, they receive strong reinforcement. If not, the therapist is ready to prompt again.
This sequence does two things at once: it stops the wrong response from getting reinforced through repetition, and it gives the learner multiple supported chances to get the right answer before trying again independently.
When Each Approach Is Used
Choosing between errorless learning and error correction depends on the individual learner and the skill being taught. There’s no universal rule. Therapists rely on data to guide the decision.
Errorless learning tends to work well for learners who become upset or disengaged after making mistakes. Some children, for example, respond to being told “no” by throwing materials or shutting down entirely. For these learners, preventing errors keeps them calm and engaged long enough to actually learn. Errorless learning is also a practical choice when teaching is being carried out by paraprofessionals or caregivers who need a straightforward, systematic protocol to follow.
Error correction is more appropriate when a learner can tolerate making mistakes without losing motivation, and when some independent problem-solving is beneficial. It’s also the natural fallback for any trial where an error occurs unexpectedly, even within a program that generally uses errorless techniques.
One important signal to watch for: if data shows a learner is being prompted on a high percentage of trials over many sessions without progressing toward independence, the current approach may not be working. Heavy prompting without fading can create “prompt dependency,” where the learner waits for help instead of attempting the response on their own. Switching strategies or adjusting the prompt hierarchy can break that cycle.
How Errorless Learning Works in Practice
A typical errorless learning session might look like this: a therapist places three picture cards on a table and asks a child to “point to the dog.” On the first trial, the therapist immediately guides the child’s hand to the correct card before the child has a chance to reach for anything else. The child is praised and given a small reward. After three successful guided trials, the therapist switches to just tapping the correct card as a visual hint. Three more successes, and the tap becomes a brief glance toward the card. Eventually, the child points to the dog independently.
Research on errorless learning for children with autism has shown that learners consistently need less assistance over time when this method is used. A study at Eastern Illinois University found that while results varied across participants, all children in the study required decreasing levels of support as errorless learning sessions progressed. The gains were modest and didn’t always generalize to new settings, but the trend toward independence was consistent.
What makes errorless learning distinctive is that the learner experiences success from the very first trial. There’s no initial period of confusion or failure. For children who are easily frustrated, or who have limited communication skills and can’t easily ask for help, this can make the difference between a productive session and one that ends in a meltdown.