Argues against the implicit use of readability formulas as guides to writing graded texts and urges experimental research to define the real factors constituting readability. (AEA)

This book is a guide to the evaluation and development of textbooks that focuses on the research on which they are based to the writing of the text. It also explores research into textbook effectiveness and provides an overview of the research in the field. The chapters are: (1) "Respondents' Opinions"; (2) "Evaluation of Textbooks by…

Those interested in textbook research, theory, and practice need to identify the independent or context variables that influence the making of a textbook--the intervening variables that come into play as textbooks are conceived, developed, and designed--and to show how these impact on the textbook, or dependent variable. To begin, critics and…