Our Building Basic Vocabulary online tool provides focused instruction and practice with Dr. Robert J. Marzano's 2,845 basic vocabulary terms and exposure to 2,889 challenge (or advanced) terms. Educators might best think of basic vocabulary as tier 1 terms and the challenge words as tier 2 terms. These 5,734 terms are organized into 420 clusters and 60 superclusters of related terms.
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