Discusses the value of writing assignments in mathematics instruction. Advocates informal, lengthy, nongraded writing as the best form of learning. Encourages the use of a learning log by students which is reviewed by both teachers and fellow students. Provides examples of short in-class mathematics writing assignments. (PAA)

Presented is a review of the research on the benefits of using writing to evaluate students' understanding of mathematics. Results indicate that student writing provides a rich resource for assessing student understanding, can have a direct influence in teachers' instructional practices, and can positively influence student-teacher interaction…