Lois sent a copy of the Twelve Concepts of Service to all Delegates and Conference members, for study and consideration prior to a vote on the Concepts at the 1970 World Service Conference in April…

In April 1970, the tenth World Service Conference unanimously approved of the Twelve Concepts of Service.

Many Voices, One Journey−Al‑Anon Family Groups (B‑31), pages 154‑155.