Vocabulary development, operationally defined as the isomorphism between an individual's store of concepts and the labels society uses to represent those concepts, is akin to concept development. Therefore, vocabulary development can be facilitated if presented in clusters of related concepts. One approach used to reinforce such basic concept clusters involves students in four steps: (1) brainstorming for words similar or related to the words from the representative concept list; (2) visualizing the meaning of each word; (3) using concepts generated during the first step in as many different forms as possible; and (4) examining affixes to identify derivational forms of words used in the first activity. Students can also use macrostructures, made from groups of related structures, as topics for language experience stories and as a broad framework for concept and vocabulary development. (Appended is a list of 430 concept clusters, derived from 7,000 most frequently used words in elementary school textbooks, arranged in such a way as to be easily grouped into macrostructures.) (HOD)