The content of the two volumes with the title People, Population Change and Policies: Lessons from the Population Policy Acceptance Study is based on the DIALOG project, an international comparative analysis of PPA survey data collected in the participating countries. The DIALOG project was funded by the European Commission for three years (2003 2005). A co-ordinated, but nationally financed PPA survey had been conducted in 14 European countries: Austria, Belgium (Flanders), Cyprus, the Czech Republic, Estonia, Finland, Germany, Hungary, Italy, Lithuania, the Netherlands, Poland, Romania and Slovenia. The second data source is a Policy-Delphi study, which follows a qualitative approach in addition to the countries mentioned above also Switzerland participated. In these two volumes for the first time the data from the DIALOG project will be systematically and scientifically analysed. The research questions can be allocated to specific issues, as they are reflected in the modular conception of the DIALOG project. These issues also structure the two volumes.