Distinguish symptoms, contributing causes, root causes, and controls in a fleet problem.
Sort the investigation statements into symptom, contributing cause, root cause, or control. Symptom Contributing cause Root cause Control Six first stops missed promised windows this week Drivers departed 12 to 18 minutes after planned start Three drivers waited at the key lockbox between 5:55 and 6:08 Two staged packets were missing fuel cards No role owns route packet staging on closing shift The depot standard says packets must be ready but does not define ready or review time Closing dispatcher signs a 5:30 p.m. packet-ready checklist Morning supervisor audits the first eight route packets twice a week
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