“…Six types of knowledge and skills, based on activities in existing curriculum and instructional design models, are identified as relevant for teachers for enacting design processes (Huizinga, 2009 Therefore, teachers as designers are expected to formulate the aim of the project and identify the problem that needs to be tackled (Crain et al, 1995;Lunenberg, 2002;Richey et al, 2001). Furthermore, various ideas have to be generated in order to tackle the identified problem (Crain et al, 1995). During the design process itself teachers are expected to systematically apply tactics to tackle the problem, by making well-founded decisions (based on insights from theory and practice), evaluating the relevancy, consistency, practicality and effectiveness of the curriculum materials (Thijs & Van den Akker, 2009) and by implementing the curriculum materials in practice (Gustafson, 2002;Kerr, 1981;Kessels, 1999;Lunenberg, 2002;Richey et al, 2001;Seels & Glasgow, 1991 …”