Social and economic systems have divergent subsystems which wilt work together effectively only when they are linked by an interface that ensures compatibility between them. Often, the individual subsystem by itself may be superb in its design, structure, and contents; and yet the total system may fail to work optimally because the interaction between, or the synchronisation of, the constituent parts has been neglected. Neglect of the interface can be costly in terms of the performance of the total system.