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 1. System boundaries 
 Internal 
 External 
 2. Phenomenological cause 
 Natural 
 Human-made 
 3. Objective 
 Malicious 
 Non-malicious 
 4. Persistence 
 Permanent 
 Transient 
 5. Dimension 
 Hardware 
 Software 
 6. Phase of creation 
 Development 
 Operation 
Faults according Avizienis
System boundaries Phenomenological cause Objective Persistence Dimension Phase of creation
1. System boundaries
Internal
External
2. Phenomenological cause
Natural
Human-made
3. Objective
Malicious
Non-malicious
4. Persistence
Permanent
Transient
5. Dimension
Hardware
Software
6. Phase of creation
Development
Operation
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