Abstract
In a study of 104 biology lessons, evidence was found of the widespread use of texts as sources of information, often unsupported by other teaching. The readability of three popular texts for the 14–16 age range was estimated by three different measures. Comprehension tests of material from the books (cloze tests) were given to 100 school biology pupils (aged 15–16 years). The results confirmed that the texts presented serious problems of comprehension for some pupils. Some implications for teachers and authors are discussed.

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