Teacher involvement in curriculum design has a long tradition. However, although it fosters implementation of curriculum reforms, teachers encounter various problems while designing related to conditions set for the design process, and lack the knowledge and skills needed to enact collaborative design processes. Providing support to enhance teachers' design expertise is essential, since most teachers are novice designers. However, little is known about the nature of the support offered to improve teachers' design expertise. In this explorative study, six teachers and six facilitators offering support reflected on an enacted design process, the problems they experienced and the support offered. The findings indicate three gaps in teachers' design expertise related to three domains (1) curriculum design expertise, (2) pedagogical content knowledge and (3) curricular consistency expertise. The outcomes of this study illustrate the importance of supporting teacher designers during the design process and enhancing teachers' design expertise. By offering (tailored) support to teachers, the enacted design process and the quality of the design materials are expected to improve.

Supporting Teacher Design Teams (TDTs) during local curriculum development efforts is essential. To be able to provide high‐quality support, insights are needed about how TDTs carry out design activities and how support is valued by the members of TDTs and how it affects their design expertise. In this study, the design and support processes of two TDTs assisted by an external facilitator were investigated using a case study approach. The results revealed that support offered to TDTs depended on the contextual boundaries and the focus of the design process. The focus, coherence and form of support affected the opportunities for developing teachers’ design expertise. In both cases, teachers’ curriculum design expertise had grown, whereas their pedagogical content knowledge and subject matter knowledge were hardly developed. Findings show that the most conducive support activities and materials were those that could directly be applied in the design process.

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Teachers’ understanding of curriculum reform and their ownership regarding the reform are expected to be promoted by having them fulfil the role of designer. However, despite these positive expectations about teachers who take an active designer role, several studies have shown that teachers lack the knowledge and skills needed for proper curriculum design. The assumption underlying the study reported in this chapter is that teachers need support during collaborative design in order to enhance their curriculum design expertise. This chapter presents and discusses the support offered to promote teachers’ curriculum design expertise during a collaborative curriculum design project conducted within the frame of a national reform in the Netherlands.