Table 2.

Use cases for prognostic health-monitoring methods. The symbols mean: The strong occurrence of a feature (✓), the absence or contradiction (×) and the occurrence of a feature in certain cases or when it is not dominant (−).

	FTA	Expert Systems	Fuzzy Systems	Analytical Redundancy	QTA	Statistic	Stochastic	ANN
Fault detection	✓	✓	✓	✓	✓	✓	✓	✓
Anomaly/new fault detection	×	×	×	✓	×	✓	×	✓
Fault classification	✓	✓	✓	×	✓	−	✓	✓
Root cause analysis	✓	−	−	−	−	−	✓	−
Remaining useful life	×	✓	✓	−	−	✓	✓	✓
Expert knowledge needed	✓	✓	✓	×	×	×	−	×
Data science/statistic knowledge needed	×	×	×	×	−	✓	✓	✓
Large dataset needed	×	×	−	−	−	−	✓	✓
Transparency	✓	✓	✓	−	✓	−	✓	×