Assessing Writing Across the Curriculum offers guidelines for effective assessment of student writing performance in various content areas such as English, science, mathematics and social studies at the junior or senior high school level. The book suggests a change in teaching methodology in order to make writing a key part of the instructional process. Written by teachers, it offers examples of applications and tools for assessment, concluding with a list of additional resources for further research.

Assessing Writing Across the Curriculum addresses issues such as assignment design, communication of expectations, scoring rubric design, and student involvement in writing assessment. It emphasizes writing to learn versus writing to test. This change in emphasis allows the student to understand how writing can contribute to his or her thinking and learning about a subject. The book utilizes the knowledge editors Duke and Sanchez have accumulated in directing National Writing Project sites and in their extensive in-service work on writing assessment with teachers.