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root cause analysis · pharmaceutical quality · deviation investigation

5 Whys Analysis for Missing Lot Numbers

Type FlowchartStandard Sugiyama layered DAG + orthogonal routingEngine schematex-flowchartUpdated 8/8/2026
5 Whys Analysis for Missing Lot Numbers
Drawing preview
The scenario

Pharmaceutical manufacturing line discovers finished units with missing lot numbers, triggering a deviation investigation using the 5 Whys technique to find systemic root cause.

What is in this drawing

Read the decisions behind it.

01

Trace problem through printer error, calibration, procedure, training, to maintenance schedule.

Use for systematic root cause analysis of quality deviations where a single causal chain is suspected.

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