Core Vocabulary for AAC: Why 50 Words Matter More Than 500

I visit a new classroom. The student has a communication device with 400 programmed symbols. The teacher proudly shows me the categories: animals, foods, colors, shapes, family members, body parts, classroom objects. It's thorough. It's well-organized. And the student uses maybe three of those 400 symbols: "iPad," "bathroom," and "snack."

This is the most common vocabulary problem in AAC, and it comes from a well-intentioned but fundamentally flawed approach: the belief that more words equals better communication. It doesn't. The right words (a small set of powerful, flexible, high-frequency words) beats a massive library of specific nouns every single time.

This is the case for core vocabulary, and once you understand it, you'll never program an AAC system the same way again.

What Core Vocabulary Is

Core vocabulary is the small set of words that accounts for the vast majority of what people say. Research by Baker, Hill, and Devylder (2000) and others consistently finds that approximately 200-400 words make up about 80% of daily communication across ages, languages, and contexts. These words are mostly:

• Verbs: want, go, get, make, put, help, like, see, eat, play
• Pronouns: I, you, it, my, that, this
• Adjectives/adverbs: more, big, little, good, bad, all, not, here
• Prepositions: in, on, up, off, out
• Social words: hi, bye, please, thank you, yes, no, stop
• Question words: what, where, who
• Determiners and connectors: the, a, and, is

Notice what's mostly absent from this list? Nouns. Specific, concrete nouns like "elephant," "pizza," "crayon," and "bicycle" are what linguists call fringe vocabulary. They're important in context, but any individual fringe word is used relatively rarely. You might say "elephant" once this month. You say "want" fifty times a day.

Why Core Words Are So Powerful

They're Combinable

"Want" by itself is a one-word request. But "want" combined with other words creates an unlimited range of messages:

• want + that
• want + more
• want + go
• want + help
• want + you + play
• not + want
• I + want + different + one

A student with 50 core words and the ability to combine them can generate thousands of unique messages. A student with 500 nouns can label 500 things and that's it. The math is clear: core words provide exponentially more communicative power per word.

They Work Everywhere

"More" works at breakfast, during art class, at recess, at home, and at grandma's house. "Applesauce" works at breakfast. Core words are context-independent. They transfer across settings without reprogramming, without new boards, without additional teaching. This is especially important for students who move between classrooms, go to after-school programs, or spend weekends with different family members.

They Support All Communication Functions

A board full of nouns supports one communicative function: labeling (or requesting, if the student has learned to use a noun as a request). Core words support every function:

• Requesting: "want more," "help me," "go outside"
• Rejecting: "stop," "not that," "all done," "don't want"
• Commenting: "look," "funny," "I like," "that big"
• Asking: "where go," "what that," "who here"
• Social interaction: "hi," "bye," "my turn," "your turn"
• Directing others: "you go," "put here," "open it"

A student who can only request is a student with a limited voice. Core words give them a full voice.

Research Backs This Up

Banajee, DiCarlo, and Stricklin (2003) analyzed the communication of young children and found that just 25 words accounted for approximately 45% of all words produced. Trembath, Balandin, and Togher (2007) found similar patterns in adults with intellectual disabilities. The core vocabulary principle holds across age groups, ability levels, and languages

Van Tatenhove (2009) specifically addressed AAC and found that systems organized around core vocabulary produced more communication acts and more diverse communication functions than systems organized around categories of nouns. The evidence is consistent and compelling.

The Most Important Core Words to Start With

If you're building a core vocabulary display for a beginning communicator, these are the words I prioritize. This isn't a universal list (every student is different), but it's the starting point I've used with dozens of students and refined over years.

Tier 1: Start Here (10-15 words)

These are the words I put on a board before I even meet the student, because virtually every communicator needs them:

more, stop, want, go, help, all done, that, I, not, yes, no, like, open, turn

With just these words, a student can make requests (want that, want more), reject (stop, not that, no), indicate completion (all done), ask for assistance (help), and express preferences (like, not like). That covers the most urgent communication needs.

Tier 2: Expand Quickly (15-25 words)

Once a student is using Tier 1 words, add:

you, it, put, get, make, see, look, here, in, on, up, off, big, little, where, what, play, eat, drink, different

Now the student can combine words into more complex messages: "you help," "put in," "get that," "look here," "I want different," "where go." They can direct other people's actions, comment on what they see, and ask basic questions.

Tier 3: Build Depth (25-50 words)

who, when, why, do, don't, can, is, he, she, we, they, my, your, out, down, some, give, come, have, feel, good, bad, same, new, tell, think, know, again

At this level, a student has the vocabulary to construct sentences, express feelings, describe experiences, and engage in real conversation. "I feel bad," "tell me," "she don't like that," "I want go again," "when we eat."

What About Nouns?

Nouns still matter. They're just not the foundation. I add fringe vocabulary (specific nouns, names, places) based on the individual student's life and needs. The student who loves dinosaurs gets "dinosaur" on their board. The student who talks about their dog all weekend gets the dog's name. The student in a cooking class gets food vocabulary for that specific context.

The key principle: core words stay permanent and in a fixed location. Fringe words rotate based on context and interest.

Many AAC systems handle this by having a main core vocabulary page that's always accessible, with links to fringe vocabulary pages organized by topic. The student navigates to the "food" page when they need "applesauce" but can always return to core words with one button press.

How to Organize a Core Word Board

Layout matters. A lot. If a student has to search for each word, they'll give up.

Motor Planning Consistency

This is the most important principle in AAC layout: every word should always be in the same location. When you add new words, you add them to empty cells; you don't rearrange existing words. The student builds motor memory for where each word lives. Over time, they don't need to visually scan for "want"; their hand goes there automatically, the same way your fingers find letters on a keyboard.

Systems like LAMP (Language Acquisition through Motor Planning) are built entirely around this principle. The motor pattern for each word never changes, even as the system grows from 14 cells to 84 cells.

Functional Grouping

While there's no single "correct" layout, many effective core boards use a modified Fitzgerald Key arrangement:

• Left column: People words (I, you, he, she, we)
• Center area: Action words (want, go, get, put, help, make, like, play)
• Right area: Descriptors and objects (more, big, little, that, it, here)
• Top row: High-frequency social words (yes, no, stop, hi, bye, please)
• Bottom row or separate area: Fringe vocabulary links

This isn't rigid. What matters is that the organization is logical, consistent, and makes sense for the student's communication needs.

Grid Size

Start with a grid size the student can accurately access. For a student with emerging pointing skills, an 8-cell display (2x4) with large targets is appropriate. Don't load 60 words onto a board a student can't physically navigate. Better to have 12 words the student can access reliably than 60 words they randomly hit.

As accuracy improves, increase grid size. Most AAC apps (Proloquo2Go, TouchChat, TD Snap, LAMP Words for Life, CoughDrop) allow you to change grid size while maintaining word positions.

Modeling Strategies That Actually Work

You have the right words on the board. Now what? Now you teach them through modeling, using the system yourself in natural interactions with the student. This is called aided language input or aided language stimulation, and it is the single most evidence-based strategy for teaching AAC use.

The One-Up Rule

Model utterances that are one word longer than what the student currently produces. If the student uses single words, model two-word combinations. If they're combining two words, model three. This keeps your models in the student's zone of proximal development, challenging but achievable.

Focused Modeling

Pick one or two core words per week to focus on. Don't try to teach all 50 words simultaneously. Monday through Friday, deliberately create opportunities to use "help" and "more" in every activity. Point to those words on the board every time they're relevant. By Friday, the student has seen "help" modeled in the context of opening containers, reaching high shelves, tying shoes, math problems, art projects, and getting dressed for recess.

Model Without Expecting

This is the hardest part for most adults. Model the system all day long. Point to the words. Use them in context. And do not (I repeat, do not) immediately turn to the student and say "now you try" or "your turn" or "show me 'more.'" Demanding imitation creates pressure. Pressure creates avoidance. The student needs a long runway of input before output emerges, just like a hearing baby needs 12-18 months of hearing language before they start talking.

I tell teams: model for 8 weeks before you even evaluate whether the student is using the system. That feels like a long time. It isn't. Language learning is slow. Consistent, pressure-free modeling is what makes it happen.

Involve Peers

This is underutilized and incredibly effective. Teach a few peers to model on the student's communication board. Kids are natural communicators, and when a peer points to "play" and "you" on the board while saying "play with you," the AAC user sees someone their own age using the system as a real communication tool, not as a therapy exercise.

I set up structured peer interactions weekly: a pair activity where both students use the communication board. The typically developing peer thinks it's a game. The AAC user gets natural, motivating models from someone who isn't an adult with an agenda.

Common Mistakes to Avoid

Mistake 1: All Nouns, No Verbs

I've covered this extensively, but it bears repeating because it's the most pervasive error in AAC vocabulary programming. If your student's board has "apple," "car," "ball," "dog," "book," and "cup" but not "want," "go," "help," "more," "stop," and "like," flip the ratio immediately.

Mistake 2: Too Many Words Too Fast

Enthusiasm is good. Overwhelming the student is not. A student who has never used aided communication does not need a 60-cell display on day one. Start with 8-15 core words. Add words as the student demonstrates understanding and use of existing vocabulary. A board that grows with the student is far more effective than one that arrives fully loaded.

Mistake 3: Hiding Words Behind Navigation

Some AAC systems bury core words two or three page navigations deep. If a student has to press "categories," then "actions," then scroll down to find "want," they won't do it. Core words need to be on the main page, accessible in one touch or one point. Every navigation step you add reduces the likelihood the word gets used.

Mistake 4: Changing Word Positions

When you add new vocabulary, resist the urge to reorganize. Shuffle the layout and you've destroyed the motor patterns the student has been building. It's like rearranging the keys on someone's keyboard. Add to empty spaces. Keep existing words exactly where they are.

Mistake 5: Programming Only What Adults Think the Student Should Say

I see boards loaded with "please," "thank you," "sorry," "excuse me" but missing "no," "stop," "don't like," and "go away." Students need to express the full range of human communication, including refusal, protest, and displeasure. If the board only lets them be polite and compliant, it's not a communication tool; it's a behavior management tool. Give them the power to disagree. That's what communication is.

Mistake 6: Ignoring the Research

Core vocabulary is not a trend or a philosophy. It's a research-backed approach with decades of evidence. If someone on your team argues for a noun-heavy, category-based system because "that's how we've always done it," share the research. Banajee et al. (2003), Van Tatenhove (2009), Boenisch and Soto (2015). The evidence is consistent and clear.

Tools Are Secondary to Strategy

I want to be honest about something: the specific tool you use to create a core vocabulary display matters far less than whether you've selected the right vocabulary and whether you're modeling it consistently.

A hand-drawn core board on cardstock, used by a trained team that models 30 times per day, will outperform a beautifully designed digital board on a $8,000 device that sits on a shelf.

That said, tools can make your life easier. Boardmaker's PCS symbols are widely recognized. Proloquo2Go and TouchChat have well-researched core vocabulary page sets built in. LAMP Words for Life was designed from the ground up around motor planning. Glint can generate a core word board quickly. CoughDrop offers open-source flexibility. ARASAAC provides free symbols for budget-constrained teams. Pick the tool that your team will actually use consistently, not the one with the most impressive features.

The investment that matters most is not money spent on technology. It's time spent modeling, training staff, involving families, and adjusting vocabulary based on what you observe. Get the words right, model them relentlessly, and the communication will come.

The shift from a noun-heavy, category-based approach to a core vocabulary approach is the single biggest improvement most AAC teams can make. It doesn't require new equipment. It doesn't require additional funding. It requires rethinking which words matter most, and the answer, supported by decades of research, is that the small, flexible, powerful words we use hundreds of times a day matter far more than the specific nouns we use once in a while.