In addition to this core vocabulary list, every lesson includes its own tiered Vocabulary Chart, categorized according to the model for conceptualizing words presented by Beck, McKeown, and Kucan (2008). Words in this chart either appear several times in the read-aloud or are words and phrases that support broader language growth, which is crucial to the English language development of young students. Most words on the chart are part of the General Service List of English Words (West 1953) or part of the Dale-Chall (1995) list of 3,000 familiar words known by fourth grade. Moreover, a conscious effort has been made to include words from the Primary Priority Words according to Biemiller's Words Worth Teaching (2010). The words on the Vocabulary Chart are not meant to be exhaustive, and teachers are encouraged to add additional words they feel would best serve their group of students.