Fifteen years ago, Jay Forrester laid the cornerstones for a more effective kindergarten through 12th grade (K-12) education based on system dynamics.  In this paper, teachers and other educators who have been implementing system dynamics and systems thinking in schools across the United States reflect on their progress. Although all of the educators have been encouraged and inspired by student engagement and insight using system dynamics in their classrooms, wider adoption has encountered obstacles.  Strategies to overcome them include: improving the quality and quantity of system dynamics curriculum materials and training opportunities for teachers, integrating the use of systems thinking tools with system dynamics simulation to give students the full benefit of both, seeking ways to work within the K-12 institution to effect change, and working together to learn from successes and mistakes.