Introduction: Networks, Relations, and StructureRelations and networks in the social and behavioral sciencesSocial network data: collection and applicationMathematical Representations of Social NetworksNotationGraphs and matrixesStructural and Locational PropertiesCentrality, prestige, and related actor and group measuresStructural balance, clusterability, and transitivityCohesive subgroupsAffiliations, co-memberships, and overlapping subgroupsRoles and PositionsStructural equivalenceBlockmodelsRelational algebrasNetwork positions and rolesDyadic and Triadic MethodsDyadsTriadsStatistical Dyadic Interaction ModelsStatistical analysis of single relational networksStochastic blockmodels and goodness-of-fit indicesEpilogueFuture directionsTable of Contents provided by Publisher. All Rights Reserved.