Henri Tajfel papers at The Wellcome Library (UK)

"The papers of Henri Tajfel (1919-1982), the Bristol University Professor of Social Psychology and eminent social psychologist, following the completion of the cataloguing process, have become accessible at the Wellcome Library. An extensive obituary for Tajfel appeared in the Journal of Language and Social Psychology, Vol. 1, No. 1, 87-89 (1982). He also has an entry in the Oxford Dictionary of National Biography and an extensive Wikipedia biography where he is credited as the principal co-developer of Social Identity Theory. This theory, developed by Tajfel and Turner, suggests that people categorize themselves into groups which Tajfel and Turner called 'in-groups', and categorize everyone else into other groups, called 'out-groups'. This categorization helps to promote a sense of identity but this leads to unfavourable comparisons between the in-group and the out-group and the enforcement of boundaries between the groups which can result in conflict in various guises"