Graded reader library of approximately 600 books across levels 1–6 with ERF scale placement¶

Design · All designs
Evidence · no claims cited

Description¶

The study's reading materials consisted of two graded reader series, the Oxford Bookworms and the Penguin Readers, at levels 1–6, with "approximately 600 graded reader books available for this study, with approximately 100 books available for participants to select from at each level". Levels were harmonized using the Extensive Reading Foundation graded reader scale so that books from different publishers could be compared in difficulty. Learners were placed at a level based on a 95 percent understanding of the text level vocabulary.

Design Implications¶

Context¶

Requirements¶

Books must be available at each learner's optimal reading level, determined by a pre-study graded reader reading level placement test

Constraints¶

No starter levels were available, so only levels 1-6 were provided

Target Learners¶

University EFL learners in mixed-ability classes

Learning Goals¶

Extensive reading experience supporting general language skills and writing improvement

Claims¶

Short Daily Er Supported By Outside Reading [+M]

15-week university extensive reading course with free choice of graded readers and book reports

Examples¶

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Key Sources¶

Mermelstein, A. D. (2015). Improving EFL learners’ writing through enhanced extensive reading. Reading in a Foreign Language, 27(2), 182–198. http://nflrc.hawaii.edu/rfl

Page metadata

Field	Value
`type`	`design`
`id`	`graded-reader-library-600-books-erf-scale`
`title`	`Graded reader library of approximately 600 books across levels 1–6 with ERF scale placement`
`description`	`The study's reading materials consisted of two graded reader series, the Oxford Bookworms and the Penguin Readers, at levels 1–6, with "approximately 600 graded reader books available for this study, with approximatel...`
`status`	`review`
`generated`	by `process:settle-candidates` on `2026-11-03`
`trust`	unverified — no one has confirmed this page's content
`sources`	1 — `mermelstein-2015`

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