One of the most important — and most often overlooked — principles in effective behavior support is this: you can't just remove a behavior without giving a child something to do instead. Replacement behaviors are how ABA addresses this directly.
What a Replacement Behavior Is
A replacement behavior is a new, appropriate skill taught to serve the same function as a challenging behavior, giving the child an effective alternative way to get their need met. If a challenging behavior serves a function — communicating frustration, escaping a demand, gaining access to something desired — simply blocking or punishing that behavior without providing an alternative leaves the underlying need unmet, which tends to be ineffective and can lead the behavior to resurface or shift into a different, sometimes more difficult form.
Why the Replacement Must Serve the Same Function
This is the core principle that makes replacement behavior teaching effective: the replacement has to actually work for the same purpose as the original behavior, or the child has little reason to use it instead. If a behavior functions to escape an overwhelming task, an effective replacement might be teaching the child to request a break — which serves the same escape function, but in an appropriate way. If a random unrelated skill is taught instead, without addressing the actual function, it's unlikely to actually replace the challenging behavior.
Common Replacement Behaviors
Depending on the function of the original behavior, common replacement behaviors include: requesting a break instead of escalating to avoid a demand, communicating "I need help" instead of showing frustration behaviorally, requesting a preferred item or activity instead of grabbing or escalating, and using a calming strategy (which we discuss more broadly in Managing Meltdowns: A Parent's Field Guide) instead of a more significant behavioral response.
The Replacement Should Be Easier, Not Harder
An effective replacement behavior generally needs to be at least as easy — ideally easier — for the child to use than the original challenging behavior. If requesting a break requires a complex sequence a child hasn't yet mastered, while the original behavior (say, throwing an item) achieves the same escape effect immediately and easily, the child has little incentive to use the harder new option. This is part of why replacement behaviors are often taught starting with the simplest possible version (even a basic gesture or single word) before building complexity.
Teaching and Reinforcing the Replacement Consistently
Once a replacement behavior is identified, it needs to be actively taught (often through prompting and practice) and then reliably reinforced every time the child uses it — especially in the early stages of teaching. If the replacement behavior isn't consistently effective at getting the same need met, the child will likely revert to whatever behavior has worked reliably in the past.
This Requires Individualized Assessment
Identifying the right replacement behavior depends entirely on accurately understanding the function of the original behavior — which is why this process starts with the functional assessment covered in Understanding the Function of Behavior, conducted by a qualified BCBA rather than guessed at generically.
Why This Approach Is More Effective Long-Term
Behavior plans built around genuine replacement behaviors tend to produce more durable, generalizable change than plans focused only on suppressing the original behavior, because the underlying need is actually being met through an appropriate channel — not just blocked.
For Mount Pleasant-Area Families
Our BCBA, Kimberly Blazer, builds individualized replacement behavior plans as a core part of every behavior support plan. Our Behavior Support & Consultation service is designed around exactly this kind of goal. our in-home ABA therapy in Mount Pleasant page has more information, or Get Started Today to get started.
This article is part of our complete guide, Understanding the Function of Behavior. Clinically reviewed by Kimberly Blazer, BCBA.