David Kellogg weighs in on the question, "Which 'threshold concept' of Halliday's can open portals for teachers?" (Originally published Jun 19, 2020)

0:07 - A question for David

2:05 - David tells us about "magic gateways"

5:02 - Teachers can use metafunctions to better diagnose and locate struggle

10:18 - The 3 great metafunctions of the Hallidayan system

12:44 - Demonstration: a closer look at one metafunction

Thank you, David.

Potentially of interest: http://tiny.cc/l8e1qz