The major objective of system design is to develop the system as it appears to the users (the external aspects of the system). The external design of the system must be suitable for the proposed business users, locations, and technology. Detailed technical design issues, however, are normally deferred until the users agree with the functionality of the interface design. The interface design must first satisfy the needs of the users in its form and its suitability to meet the business objectives.
Other objectives of design or constraints on the form of the system may also exist. For example, an objective may be that the new system development exploit and protect other system development investment. This may involve designing procedures to make the best use of current (sometimes called legacy) systems and data. The design may also have to work with some other system that is currently planned or under parallel development.
After an overall design is agreed upon, the results of the design work can supply subsequent phases of development, such as Construction.
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