I really appreciate your input. My 2 big concerns are that the teachers are not trained in block teaching and it has never been done online. If we have to switch back to online then this is model we are stuck with. And since I am paying tuition for a private school, I am paying for an educational experiment. When my options are to do a mix of online. She can take all her AP courses through CTY, she is has been a math student with CTY for years. And do a lower cost online option for other courses. Though she has 6 AP courses next year. Since she would have limited socialization with the current version, she would be relying on outside school stuff she is doing currently. She is on the planning committee for U of Toronto high school stem conference and does other technology competitions, which she did this year. And she sails, so she hangs with the race team all summer and into the fall. She has some social interaction. Sorry, basically "thinking outloud" trying to make a decision.