Where do contemporary Lean practitioners often advise placing Poka-Yoke mechanisms relative to process constraints?

Answer

Upstream of any process bottleneck or constraint

Contemporary Lean practitioners advise placing Poka-Yoke mechanisms upstream of any process bottleneck to ensure that the most expensive, time-consuming part of the process is not wasted processing parts that already contain preventable defects.

Where do contemporary Lean practitioners often advise placing Poka-Yoke mechanisms relative to process constraints?
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