This interesting blog post, "Why Learning Should be Messy," from MindShift, is an overview of a new book by a high school senior, discusses this student's views on project-based learning.
Here is my favorite quote:
The role of the teacher in project-based learning as Laufenberg likes to say is an “architect of opportunity. Through a scaffolding strategy, they help us make sense of what we have learned. Still, teachers must understand that learning is uncomfortable, messy, and complicated.” Get over compliance and control!