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"Conceptual design in itself is not the end of the design process, rather it serves as a basis for the detailed MIS design. The performance requirements specified by the conceptual design become inputs to the detailed design phase, in which these are further refined, detailed and finalized to be called the system specifications. Thus, the main objective of the detailed system design is to prepare a blueprint of a system that meets the goals of the conceptual system design requirements. Detailed system design involves the following phases. The System Design Document describes the system requirements, operating environment, system and subsystem architecture, files and database design, input formats, output layouts, human-machine interfaces, detailed design, processing logic, and external interfaces."