This work brings together internationally prominent researchers in the field of intergroup relations and group processes to highlight the role of motivational constructs in their recent empirical, theoretical and critical work. They address issues ranging from universal underlying motives for joining a group or constructing a social identity, through motives influencing choice of specific group membership, to motives associated with particular forms of inter- and intragroup behaviour. Such issues are discussed in diverse research contexts including interaction in small groups, large-scale intergroup relations, social categorization processes, social identity, cultural norms and stereotypes, intergroup contact, ethnolinguistic groups and group formation.