The Common Core State Standards place an importance on academic vocabulary. In addition to developing an advanced vocabulary, the CCSS calls for increasing the amount of nonfiction and informational text in classrooms. We know that vocabulary influences fluency, comprehension, and student achievement. And, vocabulary plays an even more important role in understanding nonfiction and informational text. It has been estimated that 80% of comprehension in nonfiction is dependent upon understanding the vocabulary.
In Appendix A of the Standards, the framework of Tiered Vocabulary by Isabel Beck is summarized. To many educators, the idea of tiered vocabulary is rather new.