A control target gate accepts a run only if the control reading lands within the tolerance window around the target, with the endpoint included. With target 10 and tolerance 1, controls 9 and 11 pass while 8 fails exactly for the stated toy gate ledger; real control materials have lot-to-lot variation, matrix effects, environmental sensitivity, and measurement uncertainty.
A control target and tolerance decide whether the run may proceed. Exact arithmetic here means exact results for the stated model inputs; measured inputs still carry uncertainty and significant-figure limits.
highlighted = computed this step
A control gate names its target and tolerance
The target is 10 with tolerance 1. The endpoint is included in this training gate.
Ctarget=10,Δ=1
Controls pass or fail by exact distance
Control 9 passes; endpoint control 11 also passes; control 8 fails.