As interest in teacher leadership has grown, many leading organizations have developed tools and guidance to support schools, districts, and teacher leaders themselves. For instance, the National Network of State Teachers of the Year developed resources on teacher leader career pathways and advocacy approaches, as well as teacher leader standards. Likewise, the National Board for Professional Teaching Standards developed teacher leadership competencies. Regional educational laboratories also have worked to better understand teacher leadership, specifically what can be learned about teacher leadership from the research literature. In collaboration and consultation with the Regional Educational Laboratory (REL) Midwest Educator Effectiveness Research Alliance, REL Midwest developed this tool to help district and school administrators gauge the extent to which district and school leaders have the necessary training, support, and culture to facilitate the identification and ongoing development of teacher leaders. The results of this assessment can be used to generate a list of areas for improvement, resources needed, and next steps to increase readiness to foster effective teacher leadership. REL Midwest researchers conducted a review of the literature on teacher leadership and worked with stakeholders in the Midwestern states to identify the most critical elements necessary for successful teacher leadership. The literature and stakeholder input shaped the content of the tool. School and district leaders, working either on their own or with colleagues, can use this tool to evaluate the extent to which existing strategies and context adequately promote and support teacher leadership.