Personnel Psychology's 40‐Questions Series: The Science and Practice of Groups and Teams

ABSTRACT Teams are core to modern organizations. Yet, the science of teams has grown increasingly specialized, making it difficult for scholars and practitioners to integrate core insights across levels of analysis and emerging contexts. In this article, we provide concise, evidence‐based responses to 40 pressing questions about the scope, design, functioning, leadership, and evolution of teams. We address foundational issues of team definition and enabling conditions; composition, diversity, and reward structures; team cognition, conflict, affect, and learning; leadership and coaching; top management teams and board dynamics; multiteam systems; and the implications of hybrid work and artificial intelligence (AI). Across these domains, several integrative themes emerge: team effectiveness is fundamentally shaped by design; individual capabilities must be activated and integrated to generate collective performance; coordination challenges change qualitatively as systems scale; and technological tools amplify, rather than replace, core teamwork mechanisms. By synthesizing current knowledge, clarifying boundary conditions, and identifying unresolved tensions, we aim to inform practical organizational decisions while advancing a more cumulative, multilevel science of groups and teams.