Behavior is communication

Every parent has said it: "He just does it for no reason." A plate flies at dinner. A shriek erupts in the checkout line. Your daughter drops to the floor the moment you say the word bath. From the outside it looks random — or worse, personal. Applied Behavior Analysis (ABA), the science of how behavior is learned and changed, starts from a different assumption: behavior always has a job. It is doing something for your child, even when neither of you could say what.

To find the job, we first have to describe the behavior itself, and describe it observably. "He had a meltdown" or "she was defiant" are interpretations, not descriptions. An observable description is something a stranger could picture and count: "He threw his cup on the floor twice," "She lay down on the sidewalk and stayed there for three minutes." This matters because vague labels hide patterns, while plain descriptions reveal them. You cannot track "attitude." You can absolutely track "left the dinner table before finishing, four nights out of five."

Once a behavior is described plainly, we ask what it accomplishes. Most challenging behavior serves one of four functions:

• Escape: the behavior gets the child out of something: a demand, a task, a noisy room. Screaming at toothbrushing time that ends with "fine, we’ll skip it tonight" has worked.
• Attention: the behavior reliably brings people. Even a scolding is attention; for some children, a stern lecture beats being ignored.
• Tangible: the behavior produces a thing or activity: the tablet comes back, the cookie appears, the sibling surrenders the toy.
• Sensory: the behavior feels good or relieves discomfort all by itself: rocking, humming, jumping, chewing. No audience required.

The catch is that the function is not visible in the behavior itself. The same behavior, say throwing a shoe, could be escape in one child (throwing ends shoe-tying practice), attention in another (everyone comes running), and tangible in a third (throwing the broccoli means it gets taken away). You cannot pick the right response until you know the job the behavior is doing, because the right response for one function can make another worse. Sending a child to their room is a consequence for attention-driven behavior — and a reward for escape-driven behavior.

None of this means your child is scheming. Functions are learned the way all habits are learned: something worked once, then twice, then it became the go-to tool. Seeing behavior as communication doesn’t excuse it; it makes it solvable. Instead of asking "How do I make this stop?", you’ll start asking "What is this behavior getting my child, and what better tool can I teach them?" The rest of this course works on that second question, and it starts with learning to observe.

Knowing the four functions is one thing; spotting one live, mid-chaos, is another. The skill to practice is narration: describing what you see in plain, countable words while resisting the pull to interpret. In the scene below, watch a parent do exactly that during a checkout-line episode. Notice that she never says "you’re just trying to get candy" or diagnoses any motive out loud. She observes, keeps her response boring, and files the pattern away for later. One observed incident proves nothing; the function shows itself around the third repetition of the same pattern.

As you watch, keep a silent tally: What happened right before the behavior? What exactly did the child do? And what did the behavior produce?