David Ausubel developed the theory of meaningful learning through subsumption. He believed that new information is best learned when incorporated into an individual's existing cognitive framework or schema. Ausubel advocated for the use of advance organizers - instructional materials presented before a lesson that provide context and structure for new concepts. By relating new ideas to what is already known, advance organizers allow individuals to incorporate new information through derivative, correlative, superordinate, or combinatorial subsumption.