I decided to create a T-GEM cycle on light & colour as this is a challenging concept in primary education for many students. After having conversations with students, it is clear that many still have difficulty explaining how light and colour works, even after full units have been completed.
Colour Vision. (n.d) Retrieved July 11 2017, from https://phet.colorado.edu/sims/html/color-vision/latest/color-vision_en.html
Khan, Samia (2011). New pedagogies on teaching science with computer simulations. Journal of Science Education and Technology 20, 3 pp. 215-232.