This field guide provides an overview of 10 modules to help schools develop their expertise in implementing the Graduate Portfolio System (GPS) learning system. Each module includes an overview, reflection questions for facilitators, notes for the facilitator, and classroom activities and reflections. The modules cover topics such as GPS outcomes, mapping outcomes, the ISSN instructional model, task design, analysis of a GPS unit, connections across networks, and managing the process. The field guide is intended to support schools and teams as they build their knowledge around developing and utilizing performance assessments with the GPS.