David Ausubel introduced the advance organizer model of teaching. The model has three phases: (1) presentation of an advance organizer to link new content to prior knowledge, (2) presentation of the new learning task, and (3) strengthening cognitive organization through comparison/contrast and clarification. An advance organizer provides an introductory framework to facilitate meaningful learning. The model requires a structured social system with an active teacher role and collaboration between students. It aims to promote both instructional and nurturant learning outcomes. Different types of advance organizers include expository, narrative, skimmed, and graphic organizers.