This study reports findings on the fidelity of implementation of the Strategic Instructional Model (SIM), Proficiency in the Sentence Writing Strategy (Schumaker & Sheldon, 1999) in five rural secondary special education classrooms. Participants were 5 special education teachers and 38 secondary students identified with mild to moderate learning disabilities. Major findings indicated a significant difference between the level of fidelity of implementation and student gains in writing complete sentences and identified specific factors that influenced the treatment delivery. Results from student attitude surveys suggested little difference in their perception of the value of writing as a result of the intervention.