Many language courses now offer access to simplified materials graded at various levels of proficiency so that learners can read at length in their new language. An assumed benefit is the development of large and rapidly accessed second language (L2) lexicons. Studies of such extensive reading (ER) programs indicate general language gains, but few examine vocabulary growth; none identify the words available for learning in an entire ER program or measure the extent to which participants learn them. This article describes a way of tackling this measurement challenge using electronic scanning, lexical frequency profiling, and individualized checklist testing. The method was pilot tested in an ER program where 21 ESL learners freely chose books that interested them. The innovative methodology proved to be feasible to implement and effective in assessing word knowledge gains. Growth rates were higher than those found in earlier studies. Research applications of the flexible corpus-based approach are discussed.
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