This article describes a program evaluation of the Direct Instruction program, Language for Writing, which was implemented in a total of 10 second through fifth grade classrooms across the United States. Student gains in writing achievement were measured pre and post-implementation. Results indicate that students made statistically and educationally significant gains in writing performance; ELL students and students in special education classrooms also obtained significant improvements in writing. Additionally, social validity questionnaires indicated that teachers were satisfied with using the program. (Copyright © 2011, National Institute for Direct Instruction (NIFDI). All rights reserved).