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A system boundary specifies the explicit separation between a considered system and its environment. It defines which components, interfaces and responsibilities belong to the system and which are external. Clear boundaries simplify interface design, responsibility allocation and risk analysis; they underpin tests and deployment boundaries.
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Theoretical construct: explains a term, principle, or mental model.
What you need to understand to reason about a domain.
A concept for explicitly distinguishing a system from its environment.
System boundaries became important in systems theory and systems engineering to make a system under study, its environment and their interactions analysable. Software architecture makes the idea concrete through components, interfaces and responsibilities.
Draw a line around the subject of interest: controlled parts are inside, while users, neighbouring systems and constraints are outside. The points where the line is crossed become interfaces and handovers.
The approach provides shared language for the system context under consideration.
Relationships, processes or measures make the effects of decisions traceable.
The approach exposes responsibilities, external dependencies and handovers for architecture and risk decisions.
System boundaries clarify which components, responsibilities and interfaces belong to a system or delivery scope.
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