1.	Supercentenarians and the theory of heterogeneity  •  James W. Vaupel, Max Planck Institute for Demographic Research; Jutta Gampe, Max Planck Institute for Demographic Research

2.	Constant global population with demographic heterogeneity  •  Joel E. Cohen, Rockefeller University and Columbia University

3.	Toward a demographic theory of societal change with predictive power  •  Wolfgang Lutz, International Institute for Applied Systems Analysis (IIASA)

4.	The impact of freedom on fertility transition: revisiting the theoretical framework  •  Martha M Campbell, University of California, Berkeley; Ndola Prata, University of California, Berkeley; Malcolm Potts, University of California, Berkeley

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