This document discusses blended learning models that combine online and in-person instruction. It defines blended learning as a teaching method that combines traditional classroom learning with online learning, allowing students to learn both in the classroom and remotely. The document outlines several blended learning models including station rotation, lab rotation, individual rotation, flipped classroom, flex, and enriched virtual. It also discusses challenges of implementing blended learning, such as ensuring students have internet access and devices, availability of offline materials, classroom size for social distancing, and parental involvement.