The OECD Economic Outlook provides a twice yearly assessment of the global economy and economic trends, prospects and policies in OECD Member countries and key non-OECD economies. It is the joint work of the staff of the Economics Department.
The "Sources and Methods" document is regularly updated as data sources change and new methodologies are adopted.
Summary details for a selection of key variables are given in the Economic Outlook Flash file (OECD.Stat). The latter contains the Economic Outlook historical data and projections across countries in downloadable form. If you are looking specifically for explanations of words, abbreviations or concepts, please consult the OECD Statistical Glossary.