Large-scale teacher professional development endeavor: the Lincoln Tri-State Institute

This article explores a two-year professional development initiative with four state geographic alliances. Professional development planners, whether planning for a large- or small-scale initiative or one with unlimited or limited funding, will benefit from learning about this successful professional development activity and how the impact in the lives of teachers and students was measured. The actual process of this professional development and the assessment methods that were used throughout the entire two years are both noteworthy and could serve as a model for others.