Reuse is part of functional decomposition and is basically an "application analysis," not a system analysis.

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Functional decomposition is a method of analysis that breaks down complex systems or processes into simpler, more manageable components. Reuse, on the other hand, refers to the practice of using existing assets (such as code, functions, or modules) in new or related contexts to save time, reduce costs, and improve efficiency. While reuse can be a part of system analysis and design by incorporating existing solutions into new systems, it is not specifically a part of functional decomposition nor limited to "application analysis." Functional decomposition focuses on dividing a system into smaller parts to understand it better, while reuse is about leveraging existing components.

Reuse Is Part of Functional Decomposition and Is Basically an "Application