Sudbury schools are not age-graded. Students are simply students at the school. In anything approach a traditional sense, there is no curriculum. There is no scope and sequence. There is no set of required courses because there are no courses. Learner interest guides the experience. Students study what they want to study. The idea is that no one knows what any given individual needs to learn more than the individual him/herself. Therefore, there is an underlying foundation of trust in the judgment of the child to choose those things he/she wants to learn. This would strike hard-core traditional curriculum advocates as license more than liberty. Certainly those who do not trust young people to decide for themselves what they should learn will have trouble with this model.