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CMA Intermediate · Operations Management and Strategic Management · Lean Operations and JIT

Which of the following is a standard rule for operating a Kanban system effectively?

Gradually reducing the number of Kanbans is a sound practice because it lowers inventory and exposes hidden problems such as breakdowns and defects. Over-withdrawal, passing on defects and producing ahead of cards all violate the basic Kanban rules of pull production.

  1. ADownstream processes may withdraw more than needed to build a buffer
  2. BDefective parts should be passed on and corrected at final assembly
  3. CThe number of Kanbans should be gradually reduced to expose problems and cut inventoryCorrect
  4. DUpstream processes should produce ahead of Kanbans when machines are idle

Explanation

Kanban rules require withdrawing only what is needed, producing only what was withdrawn, never sending defects downstream, and smoothing production. Gradually reducing cards exposes problems and lowers inventory. The other options each violate a rule.

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