What are teachers' perceptions of Response to Intervention (RTI)? To address this question, we conducted interviews about teacher perceptions of an RTI model during the second year of its implementation at an urban elementary school. Results of this qualitative study suggest that teachers' perceptions of the RTI model grew more positive during the second year, compared to the first year of the model's implementation. Teachers told interviewers that the RTI model improved the special education referral process, progress monitoring, and collaborative planning structures in their school. Implications for practice are presented.