Book excerpt: The Demographic Observatory 2015 contains selected indicators from the 2015 revision of estimates and projections for the populations analysed. The figures contained in this publication are a revision of those presented in the Observatory 2014 and include updates of the estimations and projections of national populations from 1950 to 2100, taking into account new information sources available for Chile and Guatemala. Future issues will incorporate new estimates and projections, also prepared using the component method, but by simple ages and calendar years.