The NYS Geographic Information System (GIS) Coordination Program was designed and implemented through the collaboration of governments and private entities throughout the State. This case study presents this innovative initiative as a model for data sharing and public-private sector partnerships. The report describes in detail how the GIS Coordination Program was initiated and developed, looking at the role of the different collaborators as well as the problems encountered and solutions tried. An evaluation of the costs and benefits of the project is also included, as well as a reflection on the remaining problems that need to be tackled in the coming years.