Zak Stein & Jim have a wide-ranging talk about hierarchical complexity: its history, horizontal vs vertical development, the chunking property in development, emergence & evolution, success vs understanding, child development, the development advantage of youth, representational thinking & abstraction, the connection of social complexity & hierarchical development, limitation of measures of general intelligence, core dynamics of the levels of the model of hierarchical complexity, Lectica assessments use in education & business, key leadership skills, and much more.