This glossary is a work in progress. It is designed to strengthen communication across VET (sub) systems and VET providers on European Quality Assurance in Vocational Education and Training (EQAVET) through multiple definitions in key quality assurance terminology. This multiplicity of definitions reflects their evolving development by researchers, professional bodies, governmental agencies or different international organisations (e.g. European Commission and CEDEFOP, United Nations, OECD, World Bank) in line with the changing practices in management and measurement. Where more than one definition is listed, definitions have been numbered in a non-hierarchical order.