If managed correctly, with proper amounts of chaos and structure , it can be the most efficient in conveying new knowledge and facilitating learning. The next thing to recognize are the different kinds of students. The first and most important measure is their reason for being there.
Curiosity is the well-spring from which everything else flows.
It is an unquenchable thirst. At the other end, are students that have a thirst for knowledge, and things like security and money are either a given, or at best a second thought. Modes of Learning. Are they Cognitive, or Rote learners. Do they respond better to Visualizations or Abstract descriptions, i.e., do they need to see images or do they form images in their minds.