We wished to extend this work by more fine-grained case studies, focusing on good practices. Our cases are outliers, NETs in partnership with LETs who were able to instigate positive forms of collaboration in their schools. The justification for the case
studies is that we need examples of successful practices in order to provide a basis for ongoing improvement of collaboration between NETs and LETs.Learning from cases is an important means of development. Thus, these particular cases represent ‘illuminatory instances’ (Holliday, 2002) whose purpose is to exemplify the experience of two groups of teachers.