This case study describes how the University of Chicago's Center for Elementary Mathematics and Science Education and its Urban Education Institute partnered with each other and with two charter schools and seven Chicago Public Schools. "Tools" were developed to disseminate knowledge and expertise through "models" that allowed for this knowledge and expertise to flow in many directions across all levels of the partnership. Strengths, such as the shared tool of Everyday Mathematics, and weaknesses, such as the "a la carte," voluntary nature of the professional development offerings, are discussed specifically and frankly. In fact, the lessons learned from this partnership are listed, alongside the examples of these lessons' inclusion in a new (2010) ITQ partnership with the Chicago Public Schools.