Micro-credentials, a new form of personalized professional development for teachers, offer a unique solution to the challenge of training school staff to design and implement performance assessments. In a relatively short period of time, micro-credentials have shown promise in enabling a more personalized, effective method of promoting teacher professional growth. Such a model is critically important in transitioning to new accountability systems that rely upon teachers on the ground to be designers, validators, and scorers of high-quality valid and reliable performance assessments. As we re-envision accountability systems to better serve student learning in complex and authentic ways, micro-credentials are an important vehicle to build the necessary teacher capacity to lead the performance assessment movement.