Argues that the paragraph represents a semantic unit, not just a grammatical convention. Presents original research to establish the types and frequencies of certain paragraph formats found in expository material. Discusses the most appropriate time for teaching students the ideational relationships within paragraphs. (FL)

A study examined whether writing instruction focusing on organizational patterns has a significant effect on reading comprehension. Writing samples were obtained from 18 second graders, nine of whom received no instruction, while the other nine received instruction on the purpose and use of the topic sentence, adding details to the topic, and…