Welcome to the catalogue of IPEC: International Psychosis Epidemiology Consortium. There are many early psychosis cohorts in the world. Epidemiological research with these cohorts over the past decades has greatly increased the understanding of distribution and mechanisms of psychotic disorders. Carrying out cross-country comparisons on a larger scale is extremely costly. An alternative strategy is to pool the existing large amount of data from high-quality early psychosis studies at an individual patient level. This approach has multiple advantages: it allows for examining psychosis determinants with greater precision, also including rare exposures and outcomes, focusing on (long-term) follow-up, and making optimal use of already existing data. To achieve this, the International Psychosis Epidemiology Consortium (IPEC) has catalogued and harmonized data from early psychosis cohorts and set up a virtual databank. With this databank, multiple (epidemiological) studies within the scope of the following research question will be conducted: “What drives the course of functional, existential and clinical outcomes of (early) psychosis and how does the social and geographical context shape these patterns?”..