The magic of duplicate bridge is the ability to compare pairs (or teams) that have played the same boards. Achieving this requires the development of movements (or schedules) that ensure players never play the same cards or opponents twice. There is a whole mathematical field for the study of balance of movements. Club Directors do not need to know all of this detail, the resources on movements on this page provide all a Director needs.
Here are some links to resources that may be of interest to Directors:
Publications Readily Available
Authorities on Movements for the Game of Bridge
A diagramatic representation of a six table individual movement.