Metadata in international database systems and the United Nations Common Database (UNCDB ) Robert Mayo Statistician United Nations Statistics Division Current developments in Internet technologies and their global reach Provide national and international government statisticians with many new Opportunities to provide statistical data and metadata to users. This paper provides an overview of current practices of providing metadata on sources and methods in international data systems and focuses on systems designed to provide data via Internet. The paper discusses the essential elements of a metadata system in an international statistical system. The metadata system of the United Nations Economic and Social Information System Common Database will be discussed In detail.