"On the one hand, structure involves constraint as guidelines are established. Children do not simply do whatever they like. On the other hand, structure provides children with a framework that helps them understand what is expected of them. In this way structure can be liberating as well as constraining. For example, children can approach their work in unique and flexible ways while working within the general framework. This allows different perspectives to be recognized in the effort to reach a shared goal: the successful project." The Project Approach, Bk 2, Scholastic.