Previous studies showed SIWI to be an effective practice for improving the writing and language outcomes of deaf middle school students. The purpose of this 3-year project was to develop the SIWI curriculum, instructional materials, and teacher resources for implementation with deaf students in grades 3 to 5, and to conduct a study of promise. An initial randomized controlled trial (N=78) showed SIWI positively impacts the English grammar (ES=0.53 to 0.71), length of writing (ES=1.31), genre-specific features of recount and information report writing (ES=2.64; 1.01, respectively), and writing motivation (ES= 0.53 to 0.68) of deaf elementary students. There was also a statistically significant difference between SIWI and comparison groups on all writing variables measured by the Woodcock Johnson III: spelling, fluency, writing samples (ES=1.01 to 1.82).