In November 2012, the Bill & Melinda Gates Foundation invested in seven innovative district-charter partnerships with "the potential capacity and commitment to accelerate student college ready rates through deep collaboration and sharing of best practices" (District-Charter Collaboration Grant Request for Proposal). These partnerships brought together traditional public school districts with individual charter management organizations (CMOs) and local charter schools (and, in some cases, Catholic schools) in Boston, Massachusetts; Denver, Colorado; Hartford, Connecticut; New Orleans, Louisiana; New York, New York; Philadelphia, Pennsylvania; and Spring Branch, Texas. All seven sites received grants intended to (1) facilitate collaboration on evidence-based solutions aligned with the Foundation's College Ready strategy; and (2) improve equity of access, resources, and accountability across district and charter schools. The grants ranged in size from approximately $2 million to $5 million. As part of the District-Charter Collaboration Grant program, the Foundation contracted with Mathematica Policy Research to conduct an evaluation of its implementation and effects. The three-year study examines the extent to which any of these pathways might be leading to broader cross-sector collaboration in the grantee sites. A previous report (McCullough et al. 2015) examined the early implementation (from December 2012 through winter 2013-2014) of the collaboration activities in the seven grantee cities through interviews and focus groups with central office-level administrators, school leaders, and teachers, and observations of collaboration activity in each site. This report builds on the first one, using survey data from educators (both teachers and principals) sampled from 21 cross-sector collaboration activities across the seven grantee cities in 2014-2015 to examine their collaboration experiences and perceptions. The following are appended: (1) Chapter II Supplemental Tables; (2) Chapter III Supplemental Tables; and (3) Chapter IV Supplemental Tables. [For the final report, "Understanding District-Charter Collaboration Grants. Final Report," see ED568711.]