| No | Word | Definition |
| 1 | Reliability | Can be applied whenever someone expects something or someone else to "behave" in a certain way. |
| 2 | Requirements | Indicate what features the software must contain. |
| 3 | Fault Tolerance | Can be defined as capability of the software to maintain a specified level of performance in case of software faults or of infringement of its specified interface |
| 4 | Software safety and hazard analysis | Are software quality assurance activities that focus on the identification and assessment of potential hazards that may impact software negatively and cause entire system to fail. |