Why focus on core words?
Studies across different languages and age groups have found that around 50 words account for 40-50% of our daily communication. 100 words account for 60%, and 200-400 words make up 80% of the words we use every day. Core words are usually verbs, adjectives, and pronouns, and less likely to be nouns.
By giving AAC learners quick access to these core words, we’re providing them with a powerful tool to communicate whatever they want to say. Rather than relying on preprogrammed sentences or phrases such as “I want” and “I see”, they can choose from a relatively small set of words to create their own sentences. They can express a wider variety of ideas, and work on grammar.
Core word vocabularies
There are several core-word based vocabularies available in apps (such as Proloquo2Go) or communication devices. In theory, these vocabularies should give an AAC learner 80% of the words he needs to communicate. The AAC learner would benefit more from learning how to find and combine core words to express personal thoughts and preferences.
Core words are just one important part of a communication system. All communication tools should be balanced with also quick access to fringe vocabulary and the alphabet. Access to all these words and letters lets AAC users learn to communicate for a wide variety of reasons.
Barriers to teaching core words
Why are core words often not provided or taught to AAC learners? One of the major barriers to using core words is that they can be hard to teach. Unlike nouns, most core words are not “picturable”. We can use symbols or photos of most nouns to teach the meaning of the words and represent that meaning on an AAC system. But how do we teach and represent “is”, one of the most frequently used words in English?
Model core words
Typically developing children learn language by hearing it spoken around them all day. They hear this in real-life conversations for years before they develop the ability to put together sentences. But often we hand a non-speaking child a communication device and expect him to use it after a short demonstration.
All AAC learners need to see what it looks like to communicate using their AAC systems in real conversations. This is called Modeling, or Aided Language Stimulation. The idea is to use the AAC learner’s system, or another similar AAC system when you talk with the AAC learner.
You don’t need to model every single word you say, especially at the beginning. This would be overwhelming for everyone. Instead, model one step above the AAC learner’s current skill level. So if the AAC learner is not using the communication device to communicate in single words yet, model at the single word level.
For example, if you’re leaving the classroom to go to the cafeteria, you can verbally say “It’s time to go to the cafeteria” and press the “go” button on the AAC system when you say the word “go”.
Once the AAC learner is at the one-word level, you can add a word when you model. So if you’re leaving the house to go to see grandmother, you can verbally say “Let’s go see Granny” and press “go” and “Granny” while you’re speaking these words.