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The purpose of the causal analysis is to identify the causes of the hazardous or initiating events that have been identified. How “deep” into the causes we should go depends on a number of factors, including

 How detailed is the analysis? The level of detail should be determined in step 1. A more detailed analysis requires that we go into more details on the causes.

 What causes can be influenced by the decision‐makers? Causes outside what we can change are less relevant to study in detail except to help us design a robust system that can withstand or compensate for these causes.

 Both technical, human, and organizational causes should be considered whenever relevant.

The causal analysis may form an important basis for the frequency analysis.