Careful attention to implementation is critical for a successful intervention. Reading Recovery has well-developed, context-sensitive and evolving mechanisms for ensuring quality implementation. Teacher leaders play a critical role in maintaining the quality of each implementation. In order to provide effective leadership, teacher leaders must be knowledgeable about the design principles of the intervention and skillful in problem solving issues that arise. Teacher leaders collect and analyze data to evaluate and strengthen the implementation of Reading Recovery. They create awareness, work collaboratively with stakeholders, and cultivate support for Reading Recovery at the building, district, site, and state levels.