Term Kind Topic What it is
Arrival Rate Model concept Performance Test Design Driving a load test by requests arriving per second regardless of how the system responds, rather than by a fixed number of virtual users.
Emergent Failure Scale-Dependent Failure, Threshold Failure, Non-Linear Breakage concept Performance Test Design A failure that exists only above a particular absolute scale because it depends on a fixed threshold rather than a ratio - which is why scaled-down environments validate code and not capacity.