Argues that an understanding of professional and popular science writers' goals provides a basis for both explaining and evaluating their language use. Suggests that charges normally made against both types of writing deflect attention from the obstacles writers face and the ways in which they use language to overcome these obstacles. (KEH)

Investigates the role of signaling (structural cues that announce or emphasize content or reveal content relationships) in helping good readers comprehend expository text. Finds that signals do improve a reader's comprehension, particularly comprehension two weeks after the reading of a passage and comprehension of superordinate and superordinate…

The paper discusses (1) sources of difficulty in comprehending technical writing, (2) distinctions between content structure and text structure, (3) building blocks for expository writing and techniques of text design, (4) contrasts between American and Japanese science and social studies texts, and (5) suggestions for promoting comprehension.…