Context Diagram

Context Diagram

• A DFD (Data Flow Diagram) that summarizes all processing activity within the system in single process sysbol.
• Describes highest level view of a system
• All external agents and all data flows into and out of a system are shown in the diagram
• The whole system is represented as one process
• The data flows that pass between the external entities and the system

DFD (Data Flow Diagram)

• A graphical system model that shows all of the main requirements for an information system: inputs, outputs, processes and data stroage
• They are primarily used in the systems development process
• A data flow diagram is often the diagram of choice for modern entities

Guidelines for drawing a Context Diagram

• List potential external entities (people, places). Look for entities that
• Give data to the system without explaining the process that creates that data
• Take data from the system without explaining what it does with that data
• Establish what flows are sent to and from the system from external entities

[출처] Context Diagram