Know your boundaries: reducing spatial uncertainty in urban population estimates • Deborah L. Balk, Baruch College, City University of New York (CUNY) ; Thomas Buettner, United Nations ; Valentina Mara, Columbia University ; Donghwan Kim, Stony Brook University, State University of New York (SUNY)

A simulation approach to modelling temporary populations • Elin Charles-Edward, University of Queensland

The MIMOSA model for estimating international migration flows in the European Union • James Raymer, University of Southampton

How many immigrants live in Spain? An alternative estimation to the population register based on births and fertility rates • Luis Rosero-Bixby, Universidad de Costa Rica ; Teresa Castro Martin, Spanish National Research Council (CSIC) ; David Reher, Universidad Complutense de Madrid ; María Isabel Sánchez-Domínguez, University Complutense of Madrid