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Root cause analysis (RCA) is a method of problem solving used for identifying the root causes of faults or problems.
Change analysis is nearly always used in conjunction with another RCA method to provide a specific cause, not necessarily a root cause. Change Analysis is a very good tool to help determine specific causes or causal elements, but it does not provide a clear understanding of the causal relationships of a given event. Unfortunately, many people who use this method simply ask why the change occurred and fail to complete a comprehensive analysis.