Look at the EDUCAUSE Learning Initiative, the "7 Things You Should Know about..." series.
7 Things You Should Know About the HyFlex Course Model
Abstract:
HyFlex is a course design model that presents the components of hybrid learning in a flexible course structure that gives students the option of attending sessions in the classroom, participating online, or doing both. Students can change their mode of attendance weekly or by topic, according to need or preference.
Models like HyFlex, which present multiple paths through course content, may work well for courses where students arrive with varying levels of expertise or background in the subject matter. Courses built on the HyFlex model help to break down the boundary between the virtual classroom and the physical one. By allowing students access to both platforms, the design encourages discussion threads to move from one platform to the other.
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Related link
HyFlex Course Design Theory (PDF)
Connecting Online and On-Ground Learners with HyFlex Courses
This session will report on four years of experience delivering graduate education with the HyFlex approach.
Source: EDUCAUSE