Before the current system of four regions was created, both Scouting and the Order of the Arrow utilized several different organizational structures for councils and lodges. Before the OA became fully integrated into the program of the BSA, lodges were first organized into fifteen numbered areas, which slowly grew into then twenty-six lettered areas. By September 1948, OA Areas were revised to correspond to the twelve Scouting regions. Each region was further subdivided into areas, in which lodges participated in annual training conferences.