Acknowledgements

Norbert Schmitt reviewed the book before publication and had numerous detailed suggestions for improving it. We are very grateful for his care, attention and expertise which greatly improved the quality of the book.

Part of Chapter 2 is taken from Nation, P., & Anthony, L. (2016). Measuring vocabulary size. In E. Hinkel (Ed.), Handbook of research in second language teaching and learning (Vol. 3, pp. 355–368). New York, NY: Routledge.

Chapter 3 is largely taken from the following article: Nation, I. S. P. (1993). Using dictionaries to estimate vocabulary size: essential, but rarely followed, procedures. Language Testing, 10(1), 27–40.

Parts of Chapter 4 are taken directly from Coxhead, A., Nation, P., & Sim, D. (2015). The vocabulary size of native speakers of English in New Zealand secondary schools. New Zealand Journal of Educational Studies, 50(1), 121–135, and Coxhead, A., Nation, P., Woods, L., & Sim, D. (2018). Group vs. individual: How administration procedure can affect vocabulary test scores. New Zealand Studies in Applied Linguistics, 24(2), 24–41.

Figure 6.1 comes from Diack, H. (1975b). Test your own wordpower. St. Albans: Paladin.

Figure 6.2 is from Larson, M. (2019). Estimating the vocabulary sizes of learners around the world. Presentation at IALLT 2019 (International Association for Language Learning Technology), Eugene, Oregon. <http://​www​.vocabularysize​.net​/iallt2019​/iallt​.html>.

Figure 7.2 comes from Keuleers, E., Stevens, M., Mandera, P., & Brysbaert, M. (2015). Word knowledge in the crowd: Measuring vocabulary size and word prevalence in a massive online experiment. The Quarterly Journal of Experimental Psychology, 68(8), 1665–1692.