Business architecture is a general description of a system. It identifies its purpose, vital functions, active elements, and critical processes and defines the nature of the interaction among them. Business architecture consists of a set of distinct but interrelated platforms creating a multidimensional modular system. Each platform represents a dimension of the system signifying a unique mode of behavior with a predefined set of performance criteria and measures. Designing business architecture follows the general rules of interactive design; therefore starts by assuming that the system to be redesigned has been destroyed overnight but that everything else in the environment remains unchanged.