Quarterly National Accounts (QNA) data play a vital role in developing and monitoring sound economic and financial programs. Timely data is used for detecting sources of vulnerability and implementing corrective measures. This Manual has been drafted to help countries establish or strengthen quarterly national accounts. It has been designed for compilers who have a knowledge of national accounting concepts and methods in an annual context and are in the process of introducing or improving a QNA system. It is fully consistent with the System of National Accounts 1993.