Functional communication training for beginners at home

Last updated 2026-07-10

What functional communication training actually means

Functional communication training, usually just called FCT, is a behavioral and speech-language approach developed by Edward Carr and Mark Durand in 1985 ^[1]. The idea behind it is simple: most challenging behavior, whether that's hitting, screaming, bolting, or a full meltdown, is communicating something. The child doesn't yet have a better way to say "I need a break" or "I want that," so their body says it instead.

FCT teaches a replacement response that gets the same result the behavior was already getting. If a child bangs the table because they want a snack, you teach them to hand you a picture card, tap a symbol on a tablet, or sign "more." The table-banging fades because the new method works faster and takes less effort.

This isn't about teaching vocabulary. FCT is about function. It doesn't matter if a child can label every color if they can't tell you they're in pain. The American Speech-Language-Hearing Association recognizes FCT as an evidence-based practice for autism communication intervention ^[2].

Parents often assume this is something only clinicians can do. It isn't. The research includes plenty of parent-implemented FCT studies, and the 2020 National Clearinghouse on Autism Evidence and Practice (NCAEP) report lists FCT among treatments with "strong" evidence, much of it carried out in home and community settings ^[3].

Does my child have to be autistic or nonverbal for this to apply?

FCT came out of autism research, but it's been used successfully with late talkers, children with intellectual disabilities, kids with apraxia, and verbal children who still can't reliably communicate distress or refusal ^[1]. No diagnosis required.

It fits any child with a gap between what they need to say and what they can currently say. That gap looks different from kid to kid. One screams. Another shuts down and stops eating. Another bites themselves at every transition. All of those are valid starting points for FCT, and fully verbal children with autism-related communication differences can benefit too, since FCT is really for anyone whose communication breaks down under stress, sensory overload, or unmet need.

What you do need is a functional behavior assessment, even an informal one, to figure out what the behavior is actually communicating. A speech-language pathologist is the right partner for this if you can get one. If you're not there yet, early intervention services for children under three are free under Part C of IDEA and can bring an SLP into your home ^[4].

Doing an informal functional behavior assessment at home

A formal functional behavior assessment (FBA) is done by a psychologist or Board Certified Behavior Analyst. At home, you're running an informal version, and that's a perfectly good place to start.

You're trying to answer three questions about the behavior you want to address: What happens right before it (the antecedent)? What does the behavior actually look like, described concretely? And what happens right after that seems to make it stop or get better (the consequence)?

Researchers call this the ABC pattern: Antecedent, Behavior, Consequence. Write it down for five to ten episodes and a pattern will show up fast. Common functions include getting access to something desired, escaping a demand, getting attention, and getting sensory input or relief. Here's a simple tracking example:

Once you know the function, pick a replacement that serves that same function. If the behavior is escape-motivated, the replacement communication has to actually work to escape the demand sometimes. The new response has to be honored, or the child won't bother using it.

Picking the right way for your child to communicate

This is where a lot of parents get stuck. The short version: use whatever the child can produce most reliably right now, even if that's not speech.

Spoken words or approximations work if the child has some verbal output. Manual signs suit children with good motor control but limited speech. Picture exchange, where the child hands you a card or points to an image, is a strong choice for many early communicators. High-tech AAC, like a speech-generating device or a tablet app, works even for very young children and isn't a barrier to speech. Research shows AAC doesn't stop speech from developing, and in many cases it supports it ^[5].

With AAC devices, you don't need to start with the most complex system. A single symbol on a piece of paper counts. A low-tech "break" card is FCT. You can always add complexity later.

ASHA's Practice Portal on AAC notes that a communication mode should be chosen based on the child's current motor abilities, cognitive level, and what the people around them can support consistently ^[2]. That last part matters most in practice. Pick a mode nobody at home can model and respond to, and it won't work no matter how good it looks on paper.

One honest note: if your child is showing signs of apraxia of speech, manual signs may be harder to produce accurately than pictures or AAC. Talk to an SLP before assuming signing is the easier motor option.

What an FCT session actually looks like at home

You don't need a therapy room, just the real situations where the behavior shows up. Here's a practical sequence.

Start by setting up a moment the child will want something, sometimes called contrivance: put a preferred item in sight but out of reach, pause an activity at a good part, or offer a snack portion that will run out. You're creating a genuine reason to communicate. Then wait, three to five seconds is enough, and resist the urge to hand over the item or fill the silence yourself. That pause is where the teaching happens.

If the child doesn't use the target communication on their own, prompt it. A full physical prompt means guiding their hand to the card or device. A model prompt means you demonstrate the sign or word yourself. A gestural prompt means pointing to the communication tool. Start with whatever level of prompt actually gets the response, then fade it over time.

The moment the child produces the replacement, give them what they asked for, fast. This part isn't optional: delays teach the child the new method doesn't really work. And then you repeat it. FCT works through repetition inside real situations, not through a 30-minute drill. Think five to ten trials spread through the day, folded into meals, play, transitions, and routines.

A 2008 review in Behavior Analysis in Practice by Tiger, Hanley, and Bruzek found that FCT delivered in natural settings, with the replacement response honored consistently, produces meaningful reductions in challenging behavior once caregivers get some initial coaching ^[10]. You don't have to figure this out alone, but there's a lot you can do between professional visits.

How often to practice

More than you'd think, but it shouldn't feel like drilling. Effective FCT at home tends to run somewhere between 30 and 100 communicative opportunities a day, spread across natural routines rather than set-aside practice blocks ^[7].

That sounds like a lot until you count how many times a day a child wants something, needs a break, or wants your attention. Each of those is a teaching moment. The density matters because a new communication response needs heavy reinforcement before it becomes reliable: early on, you want it to work every single time, with intermittent reinforcement coming later once the behavior is stable.

You can fold opportunities in without adding extra time to your day: meals (requesting food, drink, more, done), getting dressed (requesting help, protesting the wrong shirt), play (requesting a turn, asking for help opening a container), screen-time transitions (asking for one more minute, indicating done), and any kind of waiting. Don't count trials. Just create and respond to communication chances consistently across the whole day rather than saving it all for one practice window.

What if the replacement communication isn't working and the behavior is still happening?

This is common, and it usually comes down to one of four things.

First, the replacement might not actually work in practice. If you teach a child to hand you a "break" card but then make them sit for another ten minutes anyway, the card is pointless. You have to honor it consistently, especially in the early weeks.

Second, the replacement might be too hard to produce under stress. A child who can sign "help" during a calm practice session may not be able to manage that motor sequence when overwhelmed. A simpler option that holds up under pressure, like a big button on an AAC device or a physical card the child grabs, often works better in real conditions.

Third, the function assessment might be wrong. If you thought the behavior was about escaping something but it's actually sensory, teaching a "break" card won't help much. Go back to ABC tracking.

Fourth, you may just need more prompting early on. Some children need a prompt on nearly every opportunity for several weeks before the response starts showing up on its own. That's not failure, that's where many kids start.

If you've worked at this consistently for four to six weeks with no movement, bring in a professional. A speech therapist or BCBA can run a more systematic FBA and adjust the plan, and the autism spectrum speech therapy page has more on finding the right person.

Is FCT the same as PECS or AAC?

Not exactly, though they overlap.

PECS (Picture Exchange Communication System) is a specific structured protocol for teaching picture-based communication, moving through a set sequence of phases. FCT is a broader strategy. You can use PECS as the communication mode inside an FCT plan, but FCT doesn't require PECS, and PECS isn't always taught with a formal FCT function-replacement framework behind it.

AAC (augmentative and alternative communication) is any tool or method that supplements or replaces speech: picture boards, speech-generating devices, sign language, apps. FCT can use any of these. The FCT part is the analysis of function and the systematic teaching of a replacement; the AAC part is just the tool.

FCT is the strategy, AAC can be the vehicle. They work well together, and for many children a combination beats either one alone ^[5].

If your child already uses some form of AAC and challenging behavior is still showing up regularly, adding a formal FCT layer, one that specifically teaches a function-matched replacement, is often the missing piece. And if your child uses echolalia as a way of communicating, FCT can help channel that toward more intentional requests too.

Can parents implement FCT without a therapist?

Yes, with a realistic sense of what that involves.

Parent-implemented FCT has a genuine research base. A 2013 study in the Journal of Applied Behavior Analysis by Wacker and colleagues found that parents who received behavioral skills training in FCT, coached over telehealth, reached strong procedural fidelity and saw meaningful drops in challenging behavior at home ^[8]. The training in those studies involved a handful of coaching sessions, not a year of weekly therapy.

Most parents can manage informal ABC tracking on their own, picking a communication mode that fits what the child can actually produce, building communicative opportunities into daily routines, and responding consistently when the child attempts the replacement.

What's harder to do alone: accurate functional assessment for complex or dangerous behavior, choosing the right prompt level and fading it systematically, and recognizing when a behavior has a sensory or biological cause that FCT alone won't touch.

If your child's challenging behavior includes self-injury or aggression, get a professional involved before you start. For milder behavior like whining, dropping to the floor, or grabbing, doing FCT at home yourself is very reasonable.

If you want structured guidance between visits, tools like Little Words can help you track communication attempts, model language during routines, and stay consistent with whatever home program your SLP has designed.

And for families with no access to in-person services, online speech therapy is a real option, one that's been shown to produce outcomes comparable to in-person care for many communication goals.

How long does FCT take to work?

It depends on the child, the behavior, its function, and how consistently you can carry out the plan.

In research settings with high implementation fidelity, some studies show meaningful change within two to four weeks of daily practice ^[10]. At home, parents typically notice change in four to eight weeks, with things continuing to improve over several months as the child gets more fluent with the new communication.

The old behavior often gets slightly worse before it gets better. This is called an extinction burst: the behavior temporarily intensifies because it's no longer getting reinforced. It's a sign you're on the right track, not a sign something's gone wrong, and it usually peaks and fades within a week or two.

Progress rarely moves in a straight line. Three good days, a rough one, two good days again, that's normal. Look at the trend over weeks rather than judging any single day.

For children with more complex needs, or a long history of the challenging behavior paying off, FCT can take longer. Give it a realistic window of three to six months before expecting stable, generalized change.

What happens after the replacement communication is established?

Once the replacement is reliable in the situations you've practiced, three things need to happen next.

The child needs to generalize the new communication to places and people you haven't specifically practiced with. Set up chances for this on purpose: at grandma's house, at the grocery store, with a babysitter. New communication partners need a quick heads-up on what the replacement looks like and how to respond to it.

Then there's maintenance: keep honoring the replacement reliably, because the old behavior will come back if it stops working. This is often where gains slip, a new teacher arrives, the communication mode changes, caregivers fall out of sync. Write the plan down and share it with everyone in the child's life.

And finally, expansion. FCT starts with one function and one replacement, but over time you can add other functions, build more sophisticated language, or layer in new vocabulary. A child who started with a "break" card may eventually learn to say "I need a minute" or "this is too loud." FCT is a starting point, not a ceiling.

The early intervention window matters here too. Children who build functional communication early tend to have better long-term outcomes in both behavior and language ^[4]. Starting imperfectly beats waiting around for perfect conditions.

Are there risks, or things FCT won't fix?

FCT is one of the best-supported behavioral communication interventions out there, but it has real limits.

It works on behavior that's communicative, meaning it's maintained by something in the environment, like getting access to an item or escaping a demand. Some behavior is maintained by internal sensory factors instead, stimming that feels good on its own regardless of any social outcome. For purely sensory behavior, FCT may not reduce it much, because there's no communicative function to replace. That calls for a sensory-informed approach alongside or instead of FCT.

FCT also isn't a substitute for treating underlying needs. If a child is hitting because of physical pain (an ear infection, GI distress, a sensory issue) the behavior won't disappear from communication training alone. The AAP recommends ruling out medical causes of behavior in children who can't reliably communicate their physical state ^[9].

There's a fidelity issue too. FCT done inconsistently, where the replacement works sometimes and not others, can actually make behavior worse. Reinforcing the old behavior intermittently while the new one gets uneven reinforcement is a recipe for a pattern that's harder to change later. Consistency across everyone caring for the child isn't optional.

If your child's communication needs also include something like childhood apraxia of speech, the motor planning challenges there need their own specific treatment. FCT doesn't replace CAS therapy, but the two can run alongside each other.

Common questions about functional communication training

FCT can start as early as infancy if you've spotted a clear communication need, though most home programs begin somewhere between 18 months and 5 years. There's no cutoff on the young end. For children under 3, early intervention services under IDEA Part C can bring a speech-language pathologist into your home at no cost to help you build a program that fits where your child is developmentally.

It works for verbal kids too, including ones who still have meltdowns. Talking doesn't mean a child has the words for everything they need. Plenty of kids can narrate an entire movie scene by scene but completely fall apart when they need to say they're overwhelmed, hurting, or need a hand. FCT teaches those specific, harder skills. The mode is speech instead of a card or device, but the process doesn't change: figure out the function, teach a replacement that actually works, and reinforce it every time.

FCT and ABA aren't separate things: FCT grew out of applied behavior analysis and uses its principles, but it's one specific strategy inside that larger framework. ABA covers a lot of ground; FCT has one job, which is replacing challenging behavior with communication. Not every ABA program includes it, and SLPs and parents can run FCT outside of formal ABA therapy too. You don't need pictures or a device if your child can produce spoken words or approximations reliably. The mode should always match what the child can actually produce under pressure, not just in a calm moment. If a child has some verbal output, teaching them to say "help" or "break" or "want" is a completely valid replacement. The real test is whether that spoken response holds up when the child is stressed, which turns out to be much harder than it sounds.

Getting other caregivers on the same page matters more than almost anything else here. Write the plan on one page, not a binder: what behavior you're targeting, what the replacement looks like, and exactly how to respond when the child uses it. Then walk each caregiver through a five-minute demo. Inconsistency between caregivers is the most common way home FCT falls apart. If grandparents, daycare staff, or older siblings all respond differently, the child gets mixed signals and the old behavior sticks around longer than it should.

Should you stop responding to the challenging behavior itself while you teach the replacement? That's extinction, and it's part of the classic FCT protocol, but it takes care. Ignoring the behavior on purpose while teaching something new often causes a temporary spike first (an extinction burst) before things improve. For something mild like whining, most families can manage that at home. For self-injury or aggression, don't try extinction without a professional guiding you directly. The risk isn't worth taking on alone.

If your child doesn't seem to want anything, start with whatever they already approach on their own, whether that's one particular toy, a food, a sensory input, a video, or a routine. Even something low-preference can be a starting point. And if truly nothing seems to motivate them, that's useful information in itself: an SLP or behavior analyst can use it to look for sensory, medical, or attention needs that haven't been identified yet.

On cost: FCT delivered by a licensed SLP is typically billable under speech therapy codes, and FCT delivered by a BCBA may fall under behavioral health benefits. Medicaid in all 50 states covers ABA therapy for children with autism under the EPSDT mandate, though coverage for speech-language pathology services varies by plan. Check your plan's benefits for CPT code 92507 (individual speech therapy) and ask your provider which codes they bill under.

Echolalia often does real communicative work: requesting, protesting, filling silence, self-soothing. FCT can help by teaching intentional phrases to replace echoed strings that aren't actually serving the child. But not all echolalia should be eliminated; some of it is functional on its own terms, and an SLP familiar with autism communication can help sort out which is which. The echolalia page goes into more detail on that distinction.

FCT isn't the same as just teaching "please" or "I want," which is really vocabulary instruction. FCT is specifically tied to reducing a challenging behavior by giving the child a better way to get the same outcome, and the function has to match. If a child bites to escape a demand, teaching "I want a cookie" won't help, because the function is escape, not access. What you'd teach instead is "break please" or a break card. The replacement has to speak to what the behavior was actually communicating in the first place.

If you want to start today: pick one behavior that happens several times a day and spend two days jotting down what happens right before it and what makes it stop. That's an informal ABC log. From there, make your best guess at the function: is the child getting something, avoiding something, or getting attention? Pick the simplest communication response that could serve that function and that your child can physically do, then start prompting and reinforcing it every single time the behavior would otherwise have shown up.

For training or coaching, ASHA's website has directories for finding SLPs who work in naturalistic developmental behavioral interventions, and many of them offer parent coaching sessions built specifically for home FCT. University clinics often cost less. The Autism Speaks tool kit on challenging behavior has parent-facing FCT guidance, and if your child is under 3, IDEA Part C early intervention programs include parent training as a core part of the service.

Sources

1. Carr EG, Durand VM (1985). Reducing behavior problems through functional communication training. Journal of Applied Behavior Analysis.: FCT was developed by Carr and Durand in 1985 as an intervention teaching replacement communication responses for challenging behavior.
2. American Speech-Language-Hearing Association (ASHA), Practice Portal: Augmentative and Alternative Communication: ASHA recognizes FCT as an evidence-based practice and notes AAC selection should consider motor abilities, cognitive level, and environmental support.
3. National Clearinghouse on Autism Evidence and Practice (NCAEP), 2020 Report: The 2020 NCAEP report lists FCT among interventions with strong evidence, including studies conducted in home and community settings.
4. U.S. Department of Education, IDEA Part C Early Intervention Program: Under IDEA Part C, children under age 3 are entitled to free early intervention services including speech-language pathology in the home.
5. Millar DC, Light JC, Schlosser RW (2006). The impact of augmentative and alternative communication intervention on the speech production of individuals with developmental disabilities. Journal of Speech, Language, and Hearing Research.: AAC does not inhibit speech development and in many cases supports it.
6. Falcomata TS, Wacker DP (2013). On the use of strategies for programming generalization during functional communication training. Journal of Speech, Language, and Hearing Research.: Programming for generalization is a key component of successful FCT outcomes in natural settings.
7. Dunlap G, Iovannone R, et al. (2010). Prevent-Teach-Reinforce: The School-Based Model of Individualized Positive Behavior Support. Brookes Publishing.: Effective FCT implementation requires distributed practice opportunities throughout the day, estimated at 30-100 communicative opportunities across natural routines.
8. Wacker DP, Lee JF, Dalmau YCP, Kopelman TG, Lindgren SD, Kuhle J, Pelzel KE, Waldron DB (2013). Conducting functional analyses of behavior via telehealth. Journal of Applied Behavior Analysis.: Parents who received behavioral skills training in FCT achieved strong procedural fidelity and meaningful reductions in child challenging behavior.
9. American Academy of Pediatrics (AAP), Autism Spectrum Disorder Clinical Practice Guideline: The AAP recommends ruling out medical contributors to behavior in children who cannot reliably communicate their physical state.
10. Tiger JH, Hanley GP, Bruzek J (2008). Functional communication training: a review and practical guide. Behavior Analysis in Practice.: FCT review confirming the ABC functional assessment framework, the requirement for the replacement response to be honored consistently, and meaningful reductions in challenging behavior in natural settings.
11. ASHA Practice Portal: Autism Spectrum Disorder, Intervention: ASHA lists naturalistic developmental behavioral interventions including FCT as evidence-based for autism communication.