The Learning Partners Program (LPP) is designed to promote interschool collaborative learning. Using the Framework for Great Schools as a lens, the program creates triads of schools by matching a host school with strong practices in a specific learning focus area (LFA) with two partner schools interested in strengthening their practices in that area. Teams within each LPP school participate in a series of intervisitations, school team meetings, and related learning activities. LPP schools are supported in their work by central office facilitators, experienced educators who guide participants through the process. Through this structure and these activities, LPP seeks to: (1) Strengthen school practices; (2) Support collaboration; and (3) Strengthen system-wide knowledge. After a 2014 spring pilot with seven school triads, the Office of Interschool Collaborative Learning (OICL) has just completed its first full year of the Learning Partners Program with 24 triads. From the program's inception OICL has collaborated with the Research & Policy Support Group and the Center for Public Research and Leadership at Columbia University to evaluate and strengthen the Learning Partners Program. The case studies presented herein provide a window into the program's approach to school improvement and provide detailed accounts of program implementation in select triads. The report introduces the case study triads, describes the LPP learning process, identifies key components of successful collaboration and provides three detailed case studies. It is meant to help schools and school support staff better understand the process of interschool collaboration and provide ideas about how to successfully implement similar models. Individual case studies contain appendixes.