This document discusses threshold concepts and how making students aware of their own thought processes can help them learn more effectively. It provides examples of threshold concepts in different subject areas like graphic design, mathematics, and language skills. Threshold concepts are crucial concepts that students must understand to progress further in a subject, but can be difficult to grasp. The document advocates for teachers to explicitly identify threshold concepts, find their root causes, and help students work through challenging concepts to break down cognitive barriers to learning. It provides feedback from students on how learning about threshold concepts and meta-cognition has helped improve their confidence and independent learning.