Data Flow Diagrams (DFDs) are a graphical representation of data processes, data flows, data stores, and external entities within a system, used to visualize how information moves through a system. They are essential for understanding system requirements and identifying potential inefficiencies or areas for improvement in data handling processes.

Data Flow Diagrams

graphical representation of data processes

Data flows are like invisible roads that help information travel from one place to another, just like cars drive on roads to get from home to school. These invisible roads make sure that computers, phones, and other devices can talk to each other and share important information safely and quickly.

data flows

data stores

External entities are components that interact with a system from outside its boundaries, providing inputs or receiving outputs. They are crucial in systems analysis and design, as they help define the system's scope and interfaces with the external environment.

external entities

System requirements define the essential specifications and conditions that a system must satisfy to function optimally, ensuring it meets user needs and business objectives. They serve as a foundational guide for system development, testing, and validation, helping to prevent project scope creep and ensuring alignment with stakeholder expectations.

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