ENThe article aims at designing the coherent and sustainable system of school leadership development in Lithuania. The article provides a theoretical insight on main concepts in leadership development and highlights the organization of school leadership development system in two aspects: as a requirement to ensure that leadership development process is coherent and is adjusted to school leaders needs at different stages of their career as well as the need to provide opportunities for aspiring, newly-appointed, and established leaders to acquire and develop the skills and competences necessary to accomplish leadership tasks. Key words: school leadership development, model of school leadership development system. [From the publication]