Illustrating Detroit, Michigan, teachers' own writing-to-learn activities, this manual represents the product of course work by middle and high school science and humanities teachers enrolled in a graduate course entitled "Leadership in Writing across the Curriculum." Sections of the manual include: (1) "Writing in Science Classes"; (2) "Writing in English Classes"; (3) "Writing in Math Classes"; (4) "Writing about Social Studies Content"; (5) "Using Writing To Learn To Improve Administration and Support Teaching"; (6) "Student Voices"; and (7) "Detroit Teachers' Plans and Concerns: Toward Dissemination of Writing To Learn throughout the Curriculum." Appendixes include a course description, an agenda for a panel program, a course evaluation report, a magazine article "A Partnership in Education," and a 32-item bibliography for writing to learn in the secondary school. (RS)