John Sweller is Emeritus Professor of Educational Psychology at the University of New South Wales in Sydney, Australia, and is probably best know for his work on Cognitive Load Theory. He is also one of Greg Ashman's PhD supervisors. In this episode, John talks to Greg about the development of Cognitive Load Theory, its implications and some of the common criticisms levelled at the theory. Along the way, they discuss biologically primary and biologically secondary knowledge as well as their thoughts on the draft new Australian Curriculum.