In this overview video, Dr. Maggie McGonigle-Chalmers (University of Edinburgh) explains the behaviors of 5-year-olds as they struggle with (and eventually solve) the size-seriation task originally made famous by Jean Piaget. Dr. McGonigle-Chalmers also highlights new methods that she and co-author Dr. Iain Kusel (University of Edinburgh) used in their research, published in the November 2019 issue of the Monographs of the Society for Research in Child Development.

This research was published in The Development of Size Sequencing Skills: An Empirical and Computational Analysis, the Monographs of the Society for Research in Child Development, (84)4. For more information, including scholarship, teaching, and outreach resources, visit

Narrated and edited by Dr. Maggie McGonigle-Chalmers. All rights reserved.

Society for Research in Child Development [srcdchilddevelopment]. (2019, November 12). Overview: Seriation – A Developmental Issue | Monograph Matters 84.4 [Video File]. Retrieved from