Twenty years of group processes and intergroup relations research: A review of past progress and future prospects

The 20th anniversary of Group Processes & Intergroup Relations offers an opportunity to reflect on progress in research. We describe the changing context of research and the scope and progress in the field. This special issue includes reviews by distinguished scholars in the areas of social identity, ideology, crowds, intergroup contact, crossed and multiple social categorization, communication, majority-minority conflict, group-based emotion, group decision making, group performance, ostracism, and social-cognitive development. Achievements and current knowledge in all of these areas are raising significant new questions, challenges, and opportunities for future research, strongly demonstrating the growing scientific strength and societal relevance of research in group processes and intergroup relations.