Unschooling or relaxed homeschooling allows the child to pursue their own education, dictate content and lead by their own interest. Instead of allowing the curriculum to peak interest in previously unexplored subjects, unschoolers believe that the child's brain will lead them to everything they need to know. Some use a curriculum style from above and allow the child time to lead their own interest based learning. The best resource I can offer for Unschooling is Time4Learning - they profess to be unschooling philosophy friendly and they actually post a lot about the method on their website. A good basis can be found here.