The Principle of Anticipation and Graduated Interval Recall are the foundation of the Pimsleur Method, but there are other unique components that are also important. One is the theory of a core vocabulary. We have all been intimidated, when approaching a new language, by the sheer number of new words we must learn. But extensive research has shown that we actually need a comparatively limited number of words to be able to communicate effectively in any language.

Language can be divided into two distinct categories: grammatical structures (function words) and concrete vocabulary (content words). By focusing on function words and enabling the student to comprehend and employ the structure of a new language, Dr. Pimsleur found that language learners were able to more readily put new knowledge to use. There are very few content words that are used every day. The essential core of a language involves function words, which tend to relate to human activities.