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Leading teaching and learning together: the role of the middle tierIn education systems around the world, planners and policy makers are beginning to understand the importance of whole system improvement. To best address teaching and learning outcomes, teachers and head teachers need this whole system support to build professionalism and improve their practice. The ‘middle tier´ of education systems, or those professionals working between the school and central level, may offer a unique opportunity to facilitate collaboration, broker knowledge, scale innovations and provide instructional direction to school level practitioners.