Hello to All,
My name is Derek and I'm a public school teacher.
I've read many articles and books on these types of schools (Sudbury, Summerhill, "democratic schools," "free schools," "community schools," etc...) and, across the globe, it always seems to come back to the same basic tenets: freedom, responsibility, and self-sufficiency.
Firstly, as Liz and Scott already stated, if children are to experience freedom, they must be truly free to exercise their own will. The act of hovering over a child (as parents and teachers often do) tends to undermine a child's natural curiosity - and instead of exploring the world for themselves and of their own interests, they begin exploring it in search of approval from those above them (parents and teachers).
Secondly, responsibility for one's actions is another key component in these schools. In most of them there is a strong direct-democracy government - everyone gets one vote, as equals. Despite what some critics say, students cannot do whatever they please and it is not an "anything goes" environment. There are rules and consequences for actions. Students learn that actions have consequences in these types of environments. Interestingly, in my experience with the public-school sphere, parents tend to defend their children of their crimes instead of allowing the child to experience the consequences of their actions. This does not teach the child true responsibility - it teaches them that mommy and daddy will always bail them out of tough situations.
Lastly, self-sufficiency is the third basic tenet - and I would argue one of the most important. To truly be self-sufficient one must take control over their own life - both the inner and outer aspects of it. One side that I personally like to draw attention to is the inner-world and the words "I'm bored." These words are merely a description of someone's internal workings. A person who utters these words are, more accurately, a "boring" person - expecting other people to entertain them, or make their lives somehow better. In other words, instead of improving their own inner world they are expecting others to do the work for them. Parents often try to pacify this boredom by finding material things to occupy short attention spans. This act, again, undermines a child's natural development of self-sufficiency. Children need to learn that happiness and boredom are merely descriptions of internal states and that they have complete control over those states. They need to realize that they have the freedom to change these internal states and the process starts with learning self-sufficiency.
In summation, parents and family are important, but a safe place for children to experience true freedom, true responsibility, and true self-sufficiency must often be created independent of parental control. As Nelson Mandela said, "For to be free is not merely to cast off one's chains, but to live in a way that respects and enhances the freedom of others." In addition, Dwight D. Eisenhower said, "If you want total security, go to a prison. There you're fed, clothed, given medical care and so on. The only thing lacking...is freedom." We need to be careful of the world we create for children - is it a world without freedom?