The Nation's Report Card[TM] informs the public about the academic achievement of elementary and secondary students in the United States. Report cards communicate the findings of the National Assessment of Educational Progress (NAEP), a continuing and nationally representative measure of achievement in various subjects over time. Nationally representative samples of more than 165,000 eighth- and twelfth-graders participated in the 2007 NAEP writing assessment (the assessment was not administered at grade 4 in 2007). Each student responded to 2 out of 17 possible writing tasks intended to measure one of three purposes for writing: narrative, informative, or persuasive. Results are presented nationally for both eighth- and twelfth-graders, and in participating states and urban districts only for eighth-graders. Comparing the results of the 2007 writing assessment to results from previous years shows the progress eighth- and twelfth-graders are making in improving writing skills. Includes appendix of tables. (Contains 28 tables and 24 figures.)