A new set of values of the basic fundamental constants has been recommended by the Committee on Data for Science and Technology (CODATA) (http://physics.nist.gov/cuu/Constants/
). It is based on a least-squares adjustment that incorporates new data that became available before the closing date of 31 December 2006 (known as the 2006 LSA). A number of key advances in experiment and theory have led to significant improvements in our knowledge of the values of the constants. The consequences of the new results and how the values were determined will be discussed.