Tom A. B. Snijders is Emeritus Professor at Oxford and Groningen. His research focuses on methods for social network and multilevel analysis. He initiated the Stochastic Actor-oriented Model, 'SIENA.' He obtained honorary doctorates from the universities of Stockholm and Paris Dauphine, and the Paul L. Lazarsfeld Award from the American Sociological Association. Christian Steglich is Associate Professor of sociology at the University of Groningen and the Institute for Analytical Sociology, Linköping University. His research focuses on statistical inference for social networks, social influence, and modeling macro- and meso-level dynamics. In 2025, he succeeded Tom Snijders as maintainer of the RSiena package.

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• List of Illustrations; List of Tables; Preface; Part I. Network Dynamics: 1. Network dynamics: ties have consequences; 2. Longitudinal network data; 3. Actor-oriented models: fundamentals; 4. What drives network dynamics: effects; 5. Parameter estimation and testing; 6. Actor-oriented models: elaboration; 7. Rate functions; 8. Creating new and maintaining existing ties; 9. Local models, global consequences; 10. Absent data; Part II. Networks and Behavior: 11. Behavior change in a network context; 12. Longitudinal behavior data; 13. Modeling network-behavior co-evolution; 14. Effects for behavior; 15. Estimation and model construction for co-evolution models; 16. Diffusion of innovations; 17. Goodness-of-fit and other uses of simulated data; Part III. Special Data Structures: 18. Non-directed networks; 19. Multivariate networks; 20. Valued networks; 21. Two-mode networks; 22. Multiple groups; Glossary; References; Index.