Recovery, Unity, Service—these are the Three Legacies given to the whole membership of A.A. by its founders and their fellow oldtimers. When this heritage was announced, at the St. Louis Convention in 1955, celebrating A.A.’s 20th birthday, Doctor Bob was already gone. But Bill W. spoke for him and the other pioneers, as well as for himself, in turning over to all of us the responsibility for A.A.’s continuation and growth. “The A.A. Service Manual,” current version of the handbook first known as “The Third Legacy Manual,” may seem to be simply a guide to organization and procedure, and its approach is indeed practical. At the same time, it is based firmly upon spiritual principles, as Bill explains in his introduction to the manual, reprinted here to recall the development of our Third Legacy. Our Twelfth Step—carrying the message—is the basic service that the A.A. Fellowship gives; this is our principal aim and the main reason for our existence. – Bill W., from A.A.’s Legacy of Service