This National Science Foundation (NSF) Project Grant, awarded under the Computer and Information Science and Engineering program (CFDA 47.070), will fund a collaborative research project to study human planning and decision-making through the analysis of a massive dataset of chess games. The $562,614 award to New York University, with a project period from September 1, 2023 to August 31, 2026, will leverage artificial intelligence techniques to gain insights into how individuals form complex multi-step plans, acquire expertise over time, and develop sophisticated strategies through interaction with other players. The findings will contribute to the development and validation of new theories of human cognition, as well as the creation of improved AI systems and educational tools for complex tasks requiring planning. No sub-awards are planned under this grant.