Functional communication

Communication is functional when it works for the person

The ASHA AAC Practice Portal describes AAC as tools and techniques that help people express thoughts, needs, feelings, and ideas. It also says a person may combine aided, unaided, low-tech, and high-tech forms.

A message can be functional when it helps the person:

• ask, answer, comment, tell, joke, greet, or connect socially
• accept, refuse, stop, leave, pause, or ask for another option
• report pain, danger, discomfort, confusion, or a mistake
• request help, information, an item, attention, a break, or more time
• share an opinion, experience, plan, feeling, or novel idea
• clarify an earlier message or correct another person's interpretation

Meaning depends on context and the person. Moving toward a door, handing over an object, repeating a phrase, typing, signing, or selecting an AAC symbol may carry a clear message. Record what happened, the apparent or confirmed meaning, and how the partner checked it.

The person, partner, and environment all affect success

Functional communication requires more than a response from the person. The message form must be available and physically accessible. The partner needs to notice, understand, confirm when unsure, and respond within a useful time. The environment needs enough time, privacy, vocabulary, positioning, and safety for communication.

For example, a child may have an effective AAC message for “bathroom,” yet communication fails when the device sits in another room. A student may sign “break,” while an unfamiliar adult overlooks it. Those are access and partner problems. Avoid turning them into evidence that the person lacks the skill.

The NJC Communication Bill of Rights guidance presents individualized, functioning AAC and communication across settings as core access concerns. It is an advocacy and practice resource, so case decisions still require assessment and applicable clinical, legal, school, and payer sources.

Functional communication and FCT are different terms

Tiger, Hanley, and Bruzek describe FCT as a differential-reinforcement procedure in which an alternative recognizable communication response produces the same class of reinforcement identified as maintaining the target behavior. Their review is a practical behavior-analytic guide, not a universal treatment prescription.

FCT requires a qualified, individualized assessment and a safe implementation plan. The response should be recognizable, accessible, efficient enough for the person, and available when the relevant need occurs. AAC, speech-language, medical, trauma, assent, crisis, and environmental questions may require other professionals.

A 2020 review by Gerow and colleagues found strong evidence for FCT efficacy while identifying gaps in everyday effectiveness, including home, school, and community application, feasibility, consumer satisfaction, and broader life change. Families can ask how a proposed plan addresses those gaps for this person.

A broad communication repertoire matters

Teaching only “more,” “break,” or item requests can leave a person without language for friendship, information, protest, pain, humor, storytelling, and self-advocacy. A 2025 systematic review by Spencer and colleagues found 14 single-case studies of AAC interventions targeting commenting. The authors found promising procedures and important methodological limits, with too few studies for certainty.

Keep existing reliable messages while adding options. Avoid suppressing a gesture, movement, phrase, or AAC response before the person has an equally accessible route that partners honor. Communication access, food, water, bathroom use, movement, pain care, safety, relationships, and prescribed supports remain available regardless of performance.

Families can ask whether the plan works in real life

Ask the team:

1. Which messages and situations matter most to the person?
2. Which current forms already work, and how did the team confirm their meaning?
3. Is AAC available, charged, positioned, unlocked, and populated with needed vocabulary?
4. What counts as an opportunity, recognizable message, prompt, partner response, and repair?
5. Can the person decline, change mode, communicate discomfort, and stop practice?
6. How will partners learn the person's messages and respond consistently across settings?
7. Which measures capture effort, latency, communication variety, partner behavior, participation, and the person's view?

A qualified SLP can assess language and AAC needs. A BCBA can conduct behavior assessment and design FCT within competence and authority. Each professional should coordinate with the person, family, and other needed clinicians while preserving authorship and role boundaries.

A useful goal names the message and partner response

“Communicate appropriately” hides the goal's meaning and can reward conformity. A clearer goal identifies the person's chosen message, available modes, context, opportunity, needed support, partner response, and reason the communication matters.

Example: “When Priya needs help, a pause, or another explanation during two chosen routines, Priya may use speech, gesture, writing, or AAC. The partner will acknowledge the message within the agreed window, provide the available support, or explain what can happen next.” Measure Priya's messages and the partner's response separately.

A fictional example exposes system gaps

Priya is a fictional fourteen-year-old who uses speech, gesture, and AAC. Across ten planned routines, her chosen communication modes are available and usable at the first check in 9 of 10 routines, or 90%. The missing AAC backup stays recorded as a system gap.

During the nine access-ready routines, observers record 16 defined opportunities to ask, comment, refuse, clarify, or request a pause. Priya communicates a recognizable message in 12 of 16 opportunities, or 75%. Partners acknowledge and act or explain next steps within a fictional 15-second window for 10 of 12 messages, or 83.3%. Four no-message opportunities sit outside that conditional partner-response denominator.

Priya rates six routines workable, two tiring, and one frustrating. These small fictional counts have no baseline or comparator. They describe access, communication, partner response, and experience without showing a treatment effect.

Measures should include communication variety and access

Useful measures include access-ready routines; messages by purpose and mode; independently authored messages divided by defined opportunities; partner responses divided by emitted messages; latency and effort; prompts; breakdown repairs; communication variety; access failures; and the person's rating. Define each event, denominator, window, setting, inclusion rule, and observer procedure.

Review counts with actual examples. A high request rate can coexist with narrow language, ignored refusal, or heavy partner effort. When communication changes, examine access, partner behavior, health, context, simultaneous supports, and the person's view before assigning a cause.