This document summarizes two articles about vocabulary assessment: Testing and Teaching Vocabulary by Paul Nation, and Second language vocabulary assessment: Current practices and new directions by John Read.
The Nation article discusses statistical methods for counting words in texts and determining vocabulary frequency. It also describes developing a vocabulary levels test with matching and definition items. The Read article reviews purposes of vocabulary size measurement and sampling high-frequency words from lists. It discusses the yes/no test format and efforts to measure depth of vocabulary knowledge through association tasks and scales. The article concludes by examining ways to assess vocabulary use in context.