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Vocabulary size is strongly associated with listening, reading, and writing proficiency, and the proportion of words known in a text is closely related to reading comprehension. See the research.
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Research basis
Vocabulary size is strongly associated with listening, reading and writing proficiency, and the proportion of words known in a text is closely related to reading comprehension.
- Stæhr (2008). Vocabulary size and the skills of listening, reading and writing. doi.org/10.1080/09571730802389975
- Schmitt, Jiang and Grabe (2011). The percentage of words known in a text and reading comprehension. doi.org/10.1111/j.1540-4781.2011.01146.x
These sources support the general importance of vocabulary. They are not a claim about VCBLRY itself.