Architecting and designing : Structured analysis and design : Modeling with SSADM diagrams : SSADM diagram types : SSADM context diagrams
  
SSADM context diagrams
The context diagram represents the scope of the system under analysis and design.
The system is represented by a system symbol. Entities or objects outside of the system, but which send information to the system or receive information from the system are represented by externals. The external entities may have some descriptive text added to indicate their relationship to the system, but what goes on inside an external is outside of the system, and of no interest to it.
Toolbar buttons
System symbol
Data flow symbol
System symbol
External symbol
XOR connector
Text command
Rectangle command
Page connector command
Doc block symbol
See also
SSADM diagram types