During the process of testing a theory of several probable causes to a problem, which should be tested first?

Question:
During the process of testing a theory of several probable causes to a problem, which should be tested first?

• the easiest and most obvious
• those the customer believes to be the most important
• the most complex and difficult to diagnose
• those chosen by random selection

Explanation: Even though the customer may think that there is a major problem, start with the obvious issues before moving to more complex diagnoses.

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