Establish shared visions and support productive adaptations on all levels: Aims, strategies, and architecture of a nationwide implementation program

Large-scale implementation programs for mathematics education innovations should combine several implementation strategies and span over several levels: the mathematics classroom level, the teacher professional development (PD) level, and the facilitator PD level, as well as over the systemic contexts on each of these levels. In this paper, we present the strategies and program architecture of the German nationwide 10-year implementation program QuaMath, which aims at developing the quality of mathematics classrooms and teacher PD in cooperation with the federal states, 400 PD facilitators, and, prospectively, 10000 schools. Given the spread of intended implementation and the depth of the targeted instructional innovations, we also outline the general philosophy of establishing shared visions with all stakeholders and support their productive adaptations at the same time. This philosophy also underpins the planned implementation design research in the program.