This document outlines a presentation about considering Vygotsky's Zone of Proximal Development (ZPD) in Project Based Learning (PBL). It begins with introducing PBL and the constructivist learning theories behind it. It then discusses the key components and theory of ZPD, and how ZPD should be considered when designing learning objectives, scaffolding, and examples for PBL units. The presentation concludes by having teachers work in groups to develop a framework for a PBL unit in one of their science courses that takes ZPD into account.