The attached presentation was discussed at the annual conference of the UK Association of Teachers of Mathematics (ATM) in Sheffield on Wednesday 3rd April 2013. The video links in the presentation are as follows:
For more on the colour codes see Trivett, The coloured sticks.
Professor Trivett served as Chairman of the ATM during its first decade
. My slide 7, Cui unfolding, refers to page 193 (web 201/208) of the ebook Gattegno's Common Sense of Teaching Mathematics
. Click here
for the background to Sociality Mathematics CIC and the Tizard project.