If a Six Sigma project was to reduce repair station inventory and the team found the inventory was creeping up over time which Lean tools should be considered in the Control Phase to reestablish and sustain the project success?

If a Six Sigma project was to reduce repair station inventory and the team found the inventory was creeping up over time which Lean tools should be considered in the Control Phase to reestablish and sustain the project success?
A . Review the Visual Factory to assure inventory in excess of desired visible
B . Improve the lighting to assure adequate visibility
C . Analyze data from supplier deliveries
D . Reword the standardized work instructions to use active verbs and not passive phrases

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Answer: A