I-O psych. has been quietly evolving as a sophisticated technical discipline in the background.Münsterberg's work explored how to optimize individual performance and build effective organizations.Effective talent selection requires systematically identifying and measuring underlying traits that drive performance.Individual potential extends far beyond someone's current capabilities.Performance isn't just about how much people can handle, but the balance between demands and resources.Group performance transcends individual brilliance, but it's how effectively they work together that determines success.Even small changes in the physical environment or work schedules could significantly impact both individual and group effectiveness.Matching organizational structure to individual capabilities becomes particularly powerful in early-stage companies.The human element of organization-building becomes even more critical in an era dominated by artificial intelligence.When building a startup, you're not just creating a product, but a human system. There's a century of science to help you do it right.