Ask Why Five Times

From "What a Great Idea" by Chic Thompson.

Ask "Why" a problem is occuring and then ask "Why" four more times.

For example...

1. Why has the machine stopped?^ fuse blew because of an overload2. Why was there an overloadThere wasn't enough lubrication for the bearings3. Why wasn't there enough lubrication? The pump wasn't pumping enough4. Why wasn't lubricant being pumped? The pump shaft was vibrating as a result of abrasion5. Why was there abrasion? There was no filter, allowing chips of material into the pump Installation of a filter solves the problem.

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