In this paper, we propose a framework to help educational developers navigate the now vast literature on threshold concepts, so that they may effectively support university teachers in their work to embed threshold concept knowledge into courses and programs. This research- and practice-informed framework consists of seven principles and seven clusters of activities. It includes an 'actionable literature review' -- a distillation and synthesis of threshold concept-related knowledge that can be acted upon and adapted in a variety of settings by educational developers and teachers.