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As mentioned earlier, critical machines tend to be regarded differently by management than spared machines because:

 Owners are usually more concerned about the availability of critical machines than their maintenance costs.

 There is a much smaller set of critical failure data than spared machine failure data.

 Production losses tend to dominate the economics of critical machines.

For these reasons, availability, trends of process outages, production loss trends, Pareto downtime causes (machinery, exchangers, controls, etc.), and root causes are often used to track the reliability of critical machinery.