Successful instruction is contingent upon effective classroom management. Unfortunately, not all teachers are effective classroom managers and many require in-service professional development (PD) to increase their use of evidence-based classroom management skills. Although PD models have been developed and evaluated, many are resource-intensive. To address this, we developed a multitiered system for PD (MTS-PD) to provide increased levels of support based on need as measured by teacher behavior. We conducted two studies to examine the effect of Tiers 1 and 2 of the MTS-PD model on elementary school teachers' use of behavior-specific praise (BSP). Study 1 examined the effect of Tier 1, a single 25-min didactic training, and Study 2 examined the effect of Tier 2, which included regular visual performance feedback delivered via email. The results of Study 1 indicated that teachers did not increase their rates of BSP to a priori defined levels of success. Study 2 found that the Tier 2 PD approach increased teachers' BSP rates, a functional relationship was established, and the rates maintained 3 months after the Tier 2 PD. Study limitations and future directions are discussed.