The American Gas Association has published (June, 1998) a recommended practice; Report No. 9; Measurement of Gas by Multipath Ultrasonic Meters. This paper reviews some of the key contents of A.G.A.-9 including recommended meter performance requirements, design features, testing procedures, and installation criteria. An update for the committee work in progress for year 2001 and beyond is integrally included. The paper addresses some of the most commonly asked questions by new users of the document