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The principal methodologies for modeling and designing information systems include Structured Analysis and Design Method (SADM), which emphasizes a systematic approach to understanding requirements; Object-Oriented Analysis and Design (OOAD), focusing on representing systems as interconnected objects; and Agile methodologies, which prioritize iterative development and flexibility in response to changing requirements. Additionally, the Unified Modeling Language (UML) is widely used for visualizing and documenting system designs. Each methodology serves different project needs and contexts, helping teams effectively address complexity and enhance communication.

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