David Ausubel developed Meaningful Learning Theory, which posits that meaningful learning occurs when new information is related to an individual's existing cognitive structure through non-verbatim incorporation into relevant aspects of their knowledge. Ausubel proposed four processes for meaningful learning: derivative subsumption, correlative subsumption, superordinate learning, and combinatorial learning. According to Ausubel, meaningful learning is facilitated when instructors present general ideas before specific ones, integrate new and old ideas, use advance organizers, and focus on similarities and differences with examples.