The Generations and Gender Programme (GGP) is a system of national Generations and Gender Surveys (GGS) and contextual databases, which aims at improving the knowledge base for policy-making in countries of the United Nations Economic Commission for Europe. The GGS is a panel survey of a nationally representative sample of 18-79 year-old resident population in each participating country with at least three panel waves and an interval of three years between each wave. This publication includes four methodological documents of the GGS.