for the learning of mathematics - more info on Graven 2014

The authors asked us to draw readers' attention to a relevant video entitled "Lila and the ZPD" available at: http://www.ru.ac.za/sanc/resources/videoresources/teacherdev/#d.en.71328

Graven, M. & Lerman, S. (2014). Counting in threes: Lila's amazing discovery. For the Learning of Mathematics, 34 (1), 29-31.