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Outsourcing Internal Audits
Many smaller companies outsource internal audits.
Many large companies have a distinct department which carries out internal audits at facilities world-wide.
There are a number of possible failure modes in internal auditing. You will have to make your own decision. My opinion is to outsource internal audits.
Details are discussed in two threads:
The. Deming PDCA Cycle
8-D Problem Solving
Error Proofing (Poka Yoke)
Lead Time Reduction
Process Capability - Cp vs. Cpk
Process Loop Animation
Taguchi Loss Function
Fishbone / Cause and Effects Animation