Since the flowchart didn't produce the root cause, further analysis was done.
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- First a checksheet was performed to help narrow down the possibilities. Enters through the exit gate were included as suggested by Kate Jones, manager River Club Apartments.
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| Checksheet |
| 4:00-6:00p.m. |
| Summary |
| # that enter through exit gate | x | x | x | x |
| # of times the gate is hit by cars | x | | | |
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- The checksheet showed that the enters through the exit might be a possible root cause, but we were not sure why.
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- An Ishikawa Diagram was devised with the gate entry/exit process on the right to determine the exact root cause.
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- Bulldog Consulting then asked why their are problems with the process and came up with the two branches.
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- The suggestions resulting from the fishbone diagram would help out with the card entry system problems, so we focused our attention on the other branch.
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- The Ishikawa Diagram showed that the root cause of this branch to be the number of cars entering through the exit gate.
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