"A diagram that depicts the boundary and external interfaces of a system. It is drawn as a single circle, labeled with the name of the system, with directed lines (arrows) on the exterior of the circle indicating data flows to and from external entities, which are shown as rectangles (called 'terminators'). Context diagrams are used in structured analysis as the starting point for stepwise decomposition of the system’s data flows." (Richard D Stutzke, "Estimating Software-Intensive Systems: Projects, Products, and Processes", 2005)
"The top-level diagram in a data flow diagram that shows the environmental context in which the information system exists." (Jan L Harrington, "Relational Database Design and Implementation, 3rd Ed.", 2009)
"The highest-level diagram of a leveled set of data flow diagrams. It shows the system being studied as a single bubble connected to the outside world by its boundary data flows. This diagram, or more precisely the boundary data flows, defines the domain of the analysis study." (James Robertson et al, "Complete Systems Analysis: The Workbook, the Textbook, the Answers", 2013)
"A visual depiction of the product scope showing a business system (process, equipment, computer system, etc.), and how people and other systems (actors) interact with it." (For Dummies, "PMP Certification All-in-One For Dummies" 2nd Ed., 2013)
"A diagram that represents the actors outside a system that could interact with that system." (IQBBA)
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