The work of 47 contributors from the U.S., Canada, and Israel, the Sourcebook gives special attention to the complexity of the social support construct, expanding the field’s theoretical base by seriously reappraising social support research in the context of findings from other fields of psychology and related disciplines. Personality processes are specified to account for observed associations between social support and physical well-being. Several new studies are included which illustrate empirical approaches to exploring these processes. And key contributions highlight the great strides made in understanding the links among personal dispositions, situational contexts, and potentially supportive transactions.