There are many integrated Multi-tiered Systems of Support (iMTSS), which we refer to as integrated-tiered systems. These systems hold benefits for students with disabilities, as such systems have the potential to facilitate inclusion and focus the collective expertise of educators committed to meeting students' multiple needs. The Comprehensive, Integrated Three-Tiered (Ci3T) prevention model was designed to meet student's academic, behavioral, and social and emotional well-being needs within one integrated system. Using lessons learned over decades of research, we present a step-by-step approach to building educators' capacity to implement integrated tiered systems through data-informed professional learning. We illustrate how school leaders can use this approach to onboard new faculty, plan coordinated ongoing professional learning for all educators, and facilitate the use of data to inform instruction--all of which are intertwined through the design, implementation, and evaluation of Ci3T models.