This document discusses blended learning, which combines face-to-face classroom instruction with online learning. It describes four common models of blended learning: rotation, flex, a la carte, and enriched virtual. The rotation model involves students rotating between learning modalities, including online learning. The document outlines the key characteristics and prerequisites of blended learning, including well-trained teachers who are proficient with both online and face-to-face instruction. It also discusses the roles and responsibilities of learners and teachers in a blended learning environment, as well as the advantages and disadvantages.