When designing attractive teacher career structures, policymakers have to take a series of complex decisions. These decisions are related not only to the number of steps within the career ladder and their associated responsibilities, but also to how these positions are articulated with the salary scale and to opportunities for professional development, especially in the early years of a teacher's career. This research brief examines how a strong teacher career structure must provide teachers with incentives to progress in their careers, offer accessible and relevant opportunities for professional development, ensure competitive salaries, and generate conditions for support and formative feedback. Policymakers hence need to carefully consider each component of the design of the teacher career structure and make decisions according to their specific context, the goals of the reform and teachers' feedback on aspects of the design. [For "How Do Teachers Perceive Career Structure Reforms and How Does This Affect the Profession? Teacher Career Reforms: Learning from Experience. IIEP Research Brief. No. 2," see ED621982.]