Laureate Professor Marilyn Fleer is an Australian Research Council Laureate Fellow and Director of the Conceptual PlayLab at Monash University. She has been a curriculum writer, advisor and mentor to ACARA. From over 20 years of research, she has developed an evidence-based model that supports STEM concept formation in play-based settings and in primary schools. Recently she has been working with an amazing team of teachers on a maths curriculum project at Laburnum Primary School where Foundation to Year 6 students engaged in a Conceptual PlayWorld and RealWorld situations respectively.