A staggered A-B design study was used to evaluate the effects of Self- Regulated Strategy Development (SRSD) instruction for quick writing in middle school science across four classrooms. A sixth-grade science teacher delivered all students' writing assessment and SRSD instruction for informative quick writing. Results indicated that performance in organizational writing quality and number of words written improved for both students with and without disabilities, with large effects. Student knowledge was improved, but with smaller and more variable effects. Results of a questionnaire indicated that students were positive about the intervention.