In teaching second language (L2) vocabulary, it is useful to have a way of prioritizing words to teach from among the multitude available. Word frequency, i.e. how often various words appear in written and spoken discourse, has typically been used to inform the emphasis taken. This volume explores the need for word lists based on direct tests of learner knowledge to inform L2 pedagogy. The Knowledge-based Vocabulary Lists (KVL) are introduced, and...