On overview of the Model 3 Communication Skills lexicon, consisting of three lists of words, developed by the Southwest Regional Laboratory (SWRL) for use in communication skills instruction in K-6 is presented in this document. Three components (described in three other documents) of the Model 3 communication skills lexicon are defined. The entry lexicon is the set of words known by children entering kindergarten, the general lexicon is the set of words learned in K-6--exclusive of the words in the technical lexicon, and the technical lexicon is the set of words used by the schools to teach various subjects. Basic sources are indicated for use in determining the words in each of these components. (Author/RB)