The purpose of this study was to examine the perceptions of key informants about the processes of institutional change and collaboration involved in the development of three early college high schools (ECHS)s over a 4-year period. The 15 study participants were members of early college high school councils and included high school principals, counselors, community college administrators, and school district administrators. Participants were located at two early college high schools located on community college campuses, and one was located on a school district site. This mixed methods study used a survey and structured interviews, both based loosely on case studies from "Not so easy going: The policy environments of small urban schools and schools-within-schools" (Raywid & Schmerler, 2003) and factors identified by the Wilder Collaboration Inventory (Mattessich & Monsey, 1992) as critical to successful collaboration. The findings of the study showed that the ECHS partnership, according to the majority of its members, exhibited (a) indicators of institutional change in policy and attitude toward collaboration; and (b) the success factors of history of collaboration, favorable political climate, appropriate cross section of members, collaboration seen in self interest, sharing a stake in process and outcome, shared decision making, concrete attainable goals and objectives, and shared vision. Success factors not showing a majority response were adequate resources, mutual respect, open and frequent communication, clear roles and policy guidelines, and sufficient funds.