Common questions to ask when investigating and out of control process

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Common questions to ask when investigating and out of control process
are there differences in the measurement accuracy of instruments used ?
▢ Yes   ▢ No

Are there differences in the methods used by different operators ?
▢ Yes   ▢ No

Is the process is affected by the environment (e.g. temperature, humidity, etc) ?
▢ Yes   ▢ No

Has there been a significant change in the environment?
▢ Yes   ▢ No

Is the process affected by tool wear?
▢ Yes   ▢ No

Where any untrained workers involved in the process at the time?
▢ Yes   ▢ No

has there been a change in the source of raw materials?
▢ Yes   ▢ No

Is the process affected by operator fatigue?
▢ Yes   ▢ No

Has there been a change in maintenance procedures?
▢ Yes   ▢ No

Is the machine being adjusted frequently?
▢ Yes   ▢ No

Did the samples come from different machines? Shifts? Operators?
▢ Yes   ▢ No

Are operators afraid to report double “bad news”?
▢ Yes   ▢ No 

Is samples taken at regular intervals ? 
▢ Yes   ▢ No

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