Sentence Length: Although content is of primary importance, if there is a choice between simply worded and complexly worded texts, it may be in students' best interest to offer them the more readable texts.

Lack of introductory sentences: Because a clearly written introductory sentence after a boldfaced heading can provide students with a clear focus as they read, this may be seen as a desirable textbook strategy.

Lack of a summary sentence at the end of the section: Summary sentences immediately confirm to readers that they have understood the gist of that section. However, review questions, overview questions, and end-of-chapter review questions perform similar functions, although sometimes less directly and less immediately.

Lack of concept transition sentences: A concept transition sentence at the end of a section gets students into the effective habit of linking isolated facts and concepts into the larger framework of the chapter. In that sense, it's a plus.