The COVID-19 pandemic represents a massive global health crisis. Because the crisis
requires large-scale behaviour change and places significant psychological burdens on …

This chapter reviews research on the group identity explanation of social influence,
grounded in self-categorization theory, and contrasts it with other group-based explanations …

Studies across multiple disciplines demonstrate the importance of peers in sha** energy-
related behaviours. Research on this process is wide ranging, from documenting spatial …

Large-scale environmental crises are genuinely collective phenomena: they usually result
from collective, rather than personal, behavior and how they are cognitively represented and …

Environmental challenges are often marked by an intergroup dimension. Political
conservatives and progressives are divided on their beliefs about climate change, farmers …

We live in an age of political polarization. As political beliefs on the left and the right have
been pulled closer to the extremes, so have our social environments: we seldom interact …

Social identities are known to improve well‐being, but why is this? We argue that this is
because they satisfy basic psychological needs, specifically, the need to belong, the need …

We review research in team diversity to take stock of the current state of the science, the
trajectory that led to this state, and a potential way forward that would lead to more …

Social identity theory is an interactionist social psychological theory of the role of self-
conception and associated cognitive processes and social beliefs in group processes and …

I review evidence that individuals associate themselves—or identify—with groups in two
fundamental ways: ingroup bias and conformity to group norms. The evidence spans many …