In addition to mind maps, you can use other methods such as
brainstorming. These methods generally classify associative words
hierarchically, but the classification is not important here. The key is
to think of associative (or related) elements and make connections. The
root causes search result through the mind map of the Operation and
Maintenance System for ROK Naval ships is shown in Fig. 2.
Starting from the target system, the causal relationships of the
associative elements are indicated by arrows. Among them, those that
affect many factors (Failure Probability), those that affect the policy
of the system (Maintenance policy), those that require a separate
analysis independent of the system (Maintenance technology), and the
academic theory (Schedule pressure) are root causes. It is necessary to
reflect the expert’s domain knowledge rather than the analyst’s
subjective judgment.