An information system solution's systems design model is made up of all the specifications necessary to implement the functions discovered during systems analysis.
An identified need is addressed during the conceptual design stage, during which requirements for prospective solutions are formulated, those solutions are considered, and a system specification is created.
An interaction model is a dynamic model that depicts how a system interacts with its surroundings as it is being used (for example, a use case diagram plus a structured natural language description).
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