At the beginning of the project, students are introduced to key content in an authentic context via a stimulus or hook, which in PBL we call an entry event. Students use the entry event to initiate inquiry by reflecting on their prior knowledge of the key content and then generating questions that they “need to know” the answer to in order to successfully complete the project, and what their next steps might be to answer their questions.These questions, or need to knows, are used in an ongoing way throughout the project to track learning and guide inquiry. This guide introduces strategies for supporting students in identifying what they know and need to know.