Teacher professionalization has been focused too strongly on external experts and a one-size-fits-all set of solutions that often fail to distinguish between the needs of different teachers. This article describes a research into teacher networks that might be more successful vehicles for professional development of teachers. The results show that networks that focus on (self-) reflection, that exploit subgroups and networks meetings with a strong content focus, that stimulate enthusiasm and are instructive, that build a community of teachers and that make room for application of new materials/methods in the classroom, are the most promising ways for professional development and job motivation. (Contains 1 figure and 6 tables.)