This document discusses vocabulary development and instruction. It notes that vocabulary knowledge is an important part of communication competence. It provides facts about vocabulary, such as students learning about 3,000 new words per year on average. The document discusses different components of knowing a word and different conditions of unfamiliar words. It also discusses stages of vocabulary knowledge, goals and guidelines of vocabulary instruction, and characteristics of effective direct vocabulary teaching. Finally, it discusses different tiers of vocabulary focus and types of vocabularies for students in lower and upper grades.