Priesthood Correlation announced at the priesthood session General Conference by Harold B. Lee. President McKay said, "... It is one of the greatest undertakings that have yet been presented to the Priesthood. It has been under consideration for many years ..."
Elder Lee spoke of correlation's four goals: "First, that each organization was to have its specific function, and it was not to usurp the field of the other which would be like the eye saying to the hand, 'I have no need of thee.' Second, that each sub-division is of equal importance in the work of salvation, just as each part of the physical body is essential to a complete human being. Third, that all may be edified or educated together; and Fourth, that the system may be kept perfect, or in other words, that within the framework of the Lord's plan of organization for the salvation of his children, the Church will perform as a perfectly organized human body, with every member functioning as it was intended. Pres. McKay in his diary later noted that Elder Lee masterfully explained that three correlations committees would handle the activities and materials for the three age groups.
[Correlation Timeline, Compiled by Lisle Brown]