This report focuses on how students across the nation, of three different ages--9, 13, and 17--revise their own writing. The report is based on detailed analyses of two writing assignments: the first required 9-year-olds and 13-year-olds to write and revise a school report about the moon, and the second required 17-year-olds to write and revise a letter of complaint in response to a practical, reasonably complex situation. Approximately 2,500 individuals at each age level responded to one of these exercises. The interaction of such variables as group differences, sex, race, parental education, community type, and region is summarized. Several visual displays of the data obtained are included. (KS) Primary type of information provided by report: Results (Selective).