Preventing unexpected events (grey swans)
Unexpected events may be due to careless design, typically due to budget and delivery time
constraints.
Some of the unexpected events may be prevented by constraining the
system to operate in the
design scope. Event that might change the
situation away from the scope are rejected.
Limitations
- The nature of unexpected events
is that sometimes we cannot reject them, because the design is not prepared to handle them. Therefore, only certain unexpected faults can be prevented this way.
- Although the system
remains formally in the
design scope, it may be the case that actually, it is in an unknown situation, not formalized in the
system specifications, and not implemented thereof.
Updated on 05 May 2016.