Hi, I am researching blended learning right now. I am wondering what are the possibilities to classify various blended learning interventions. When researching this topic a four model classification comes up (flex model, rotation model, self-blend model & enriched-virtual model; Staker&Horn, 2012). I think that this classification have some drawbacks (i.e., it doesnt take the degree of self-regulated learning into account). To your knowledge, are there any more well known and well cited (or promising) classifications (typologies) of blended learning?