When your child repeats a favorite line from a movie, brings you a book and waits expectantly, or walks away from a busy room to sit quietly, there is a story unfolding. In Applied Behavior Analysis, we assume behavior is meaningful. Children do things for a reason, and when we understand that reason, we can respond with more compassion and teach skills that truly help. Behavior analysts call that reason the function of the behavior. In plain language, function means what the behavior gets for the child, such as attention, a break, a favorite item, or a comfortable body feeling. Functional Behavior Assessment, or FBA, is a structured way to learn that “why” so we can design kinder and more effective supports.
First, notice the storyline around the behavior
One helpful way to listen for the “why” is to pay attention to what happens before the behavior, what the behavior looks like, and what happens after. Behavior analysts call this ABC data collection, which stands for antecedent, behavior, and consequence. Interviews and simple observation notes can reveal clear patterns. For example, shouting shows up when attention is low and tends to produce attention, or refusal spikes when hard tasks appear and tends to produce a break. Breaking up that pattern into the antecedent, the behavior, and the consequence can help pinpoint the ‘why’ behind their behavior and direct you to a solution.
Professionals typically follow a stepwise process. They gather information from interviews and notes, look for patterns, test the best guess when needed, and then build supports that match the function.
The four most common reasons a behavior sticks around
Across decades, research shows that both helpful and challenging behaviors are shaped by what happens around them. Behaviors can be strengthened by getting something or by getting out of something, and sometimes the behavior itself produces a pleasant or calming sensation. That is why analysts talk about functions in four broad categories.
Attention. Some behaviors pull people in. A child may call out when you start a phone conversation because the behavior reliably brings your eyes, your voice, or even a quick “No.”
Escape or avoidance. Some behaviors help a child get away from hard work, loud spaces, or confusing transitions. When refusal reliably postpones the task, the behavior makes sense to the child.
Access to tangibles. Some behaviors are a “please give me the thing” request in disguise. Think of swiping the tablet or crying for a snack. Indirect checklists can help you notice this pattern, although they are best used to form an initial hunch that you later confirm through observation.
Automatic or sensory. Sometimes the behavior itself feels good or reduces discomfort, and no other person is needed. Hand flapping, humming, or pressing on a tooth can be examples. Analysts use the term automatic reinforcement to describe these cases, and they caution us not to jump to that label too quickly without looking for social patterns first.
A helpful mindset is to focus on what the behavior accomplishes rather than what it looks like. Very different behaviors can serve the same purpose, which means the plan should be matched to the function, not the form.
What you can try at home this week
Try these tips at home this week to take the first step.
Observe one routine. Choose a daily pinch point, like getting dressed or leaving the park. Jot a single ABC note on your phone. What usually happens right before the behavior, what exactly does your child do, and what usually happens right after. These details often reveal the “why.”
Lean into connection first if attention seems to be the driver. Before the tricky moment, fill your child’s attention cup with a warm greeting, a high-five, or praise for what they are already doing well. When the behavior shows up, quietly shift your attention toward the skill you want, such as a gentle tap and “look.” This is the everyday version of differential reinforcement.
Offer choice and teach a brief break if escape seems likely. Try a simple “first, then” picture, break work into tiny steps, and teach a quick break request. Honor short breaks and return to the task, gradually growing stamina. This is a parent-friendly form of Functional Communication Training, also known as FCT.
Model a clear ask if the goal is tangible. Help your child point, hand you a picture, sign, or say one word to request the snack or toy. Give it quickly for the new ask and, when possible, make waiting short and predictable.
Offer safe sensory alternatives when the behavior seems body-driven. Try chewy jewelry, a fidget, a brief stretch, music, or quiet time. Build a day that has regular movement and calming activities. When behaviors are intense or dangerous, reach out for professional support to analyze triggers and build safer alternatives.
Why replacement skills are the heart of the plan
The most durable, humane plans teach a functionally equivalent new behavior that achieves the same outcome as the challenging one. If a child hits to get a snack, teach a picture exchange or a short phrase that gets the snack faster. If a child screams to get a break, teach “Break, please” and make that request work. Modern ABA also emphasizes positive reinforcement and the child’s voice. Board Certified Behavior Analysts are required to focus on positive reinforcement and to avoid aversive procedures. Your values matter here. You are the expert on your child, and a good clinician will partner with you to design supports that feel respectful and workable.
Final Thoughts
Understanding behavior through the lens of function turns daily moments into useful information. When you notice what happens before and after an action, you begin to see the purpose behind it. That purpose points to a plan that is kinder, clearer, and more effective. Teaching a simple, functional way to ask for attention, a break, a favorite item, or a sensory support can reduce stress and build independence.
You do not have to figure this out on your own. Partner with your school team and your ABA provider to create supports that reflect your child’s strengths and your family’s values.
| Let us help you be the best advocate for your child. Reach out at acclaimautism.com |
For more reading on this topic, please check out the following resources:
Cooper, J. O., Heron, T. E., & Heward, W. L. (2007). Applied behavior analysis (2nd ed.). Pearson.
Gitimoghaddam, M., Chichkine, N., McArthur, L., Sangha, S. S., & Symington, V. (2022). Applied behavior analysis in children and youth with autism spectrum disorders, a scoping review. Perspectives on Behavior Science, 45, 521 to 557.Yu, Q., Liang, W., Li, L., & Li, E. (2020). Efficacy of interventions based on applied behavior analysis for autism spectrum disorder, a meta-analysis. Psychiatry Investigation, 17(5), 432 to 443.
