Demographic ageing and population change is a pressing problem in a growing number of countries. This course introduces participants to core demographic theories, data, measures, and methods. Participants will be informed where to locate high quality demographic data. We will learn how to calculate and correctly interpret demographic indicators such as the fertility rate, the mortality rate, and measures that can be derived from migration statistics. Moreover, we will learn how to forecast populations (using the cohort-component model). There is also time devoted to debating policy-relevant themes.