What makes an actor's position in social structure robust rather than fragile? This article introduces a network model that pictures occupants of robust positions as recipients of diversified support from durably located others, and portrays occupants of fragile positions as dependents on...

We introduce the concept of structural redundancy as a qualitatively different kind of reconciliation between two long-standing focuses of organizational and groups research - heterogeneity and homogeneity in organizations' personnel. Redundancy captures the structural arrangement whereby...