| safety critical system | has example systems that control industrial processes, vehicles, telecommunications networks, medical equipment and many consumer devices |  |
| is a subtopic of 4.7 - Types of Requirements Document |  |
| is a kind of system |  |
| must have its requirements subjected to rigorous analysis and review |  |
| should be precisely specified if it could jeopardize safety or the environment if it fails |  |
| system | can have specification which is then implemented by a collection of components |  |
| exists even if its components change over the course of time, or are replaced by equivalent components |  |
| has scope |  |
| has part component |  |
| has part hardware |  |
| has part module |  |
| has part software |  |
| has part subsystem |  |
| is complex if its scope is broad |  |
| is in a state until an event occurs that causes it to change state |  |
| is divided up into subsystems |  |