When campuses closed due to the spread of the coronavirus and the threat posed by the COVID-19 illness, faculty who were teaching HyFlex classes were already prepared to teach high-quality, fully online courses. The classic HyFlex (hybrid-flexible) course design model supports both in-class and online students in the same class sections, typically by using a combination of synchronous and asynchronous online participation paths for students who choose not to, or are unable to, participate in traditional classroom instruction.
https://er.educause.edu/blogs/2020/5/can-hyflex-options-support-students-in-the-midst-of-uncertainty
