It's a private school that believes that the parents are the best judges as to the quality of their children's education. They issue diplomas for homeschool kids. They offer no curriculum, but you do have to meet their basic high school requirements. (17 credits, so many in each required subject, etc) You submit a portfolio, they review it, you have phone conferences and they issue the diploma. It's not cheap, but for a solid diploma, (and the freedom to teach my kids what I want and HOW I want) I think it's worth it.