Acknowledge Core vs. Core words are structure words such as pronouns, verbs, determiners, adverbs, adjectives, and prepositions. Almost no core words are nouns and even fewer are object nouns, the only words with an obvious picture association. Core words are the basis of interactive communication. Extended vocabulary is made up of the remaining thousands of words.
Most nouns are part of the extended vocabulary.
Extended vocabulary words tend to be content or topic specific. These words are important, but are not used nearly as often as core vocabulary words. Generally, core vocabulary is best accessed using semantic compaction and extended vocabulary is best accessed using alphabet based systems or single meaning pictures. Acknowledge the Significance of Cognitive Science and Human Factors Issues Generally, systems designed for ease of use at first encounter are not efficient for use in the long term and vice versa. Changing lists and selection areas can eliminate the possibility of building the motor planning skills required for automaticity.