A large implementation programme accompanied the curriculum development with working groups of teachers. ChiK combined the development of teaching units, the implementation in schools, and the professional development of teachers. By the end of 2008, more than 200 teachers and more than 4000 students in Germany participated in the project, while many more probably used the ChiK material. Socio-scientific issues based chemistry teaching In the previous section we discussed how learning chemistry can be embedded in the contention for utilising contexts from everyday life or society to make learning more motivating and sustainable.