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Concept for clearly delimiting a system from its environment.
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.
Measures exposed API/interface endpoints across a system boundary.
Count of failures caused by boundary or interface issues during integration tests.
Time until an ownership question at a boundary is clarified.
Visualization of the payment service boundaries against external gateways and internal accounting systems.
Definition of which APIs remain internal and which are exposed as external interfaces.
Determination of which components must be deployed isolated per tenant and which can be shared.
Create a coarse context diagram including all external actors.
Detail interfaces and responsibilities along the boundary.
Validate the boundary with stakeholders and in integration tests.