This article describes the evolving stages of the establishment and development of a professional development school partnership. Whereas many such articles center on outcomes only, this one describes the developmental stages necessary to support a strong professional development partnership that allows for distributed learning for all parties involved. These stages include exploration, formalization, action, institutionalization, critical growth, and sustainability, which vary somewhat from those of traditional professional development schools in the detail concerning the later stages. As such, these stages can aid program designers in developing their professional development collaborative partnerships. Positive learning outcomes occur for all parties involved when these steps are utilized. In this article, we provide examples of the stages, their potential challenges, sample evaluation plans, and a flowchart for development.