“A well-designed HyFlex class, with effective alternative participation modes
that all lead to the same learning outcomes, can provide meaningful learning opportunities for all students.” Brian Beatty

https://library.educause.edu/resources/2020/7/7-things-you-should-know-about-the-hyflex-course-model

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more on the HyFlex model in this IMS blog
https://blog.stcloudstate.edu/ims?s=hyflex