Six reasons why dependability is important are:
1. Users may not use the system if they don't trust it.
2. System failure may lead to a loss of business.
3. An undependable system may lose or damage valuable data.
4. An undependable system may damage its external environment.
5. The reputation of the company who produced the system may be damaged hence affecting other systems.
6. The system may be in breach of laws on consumer protection and the fitness of goods for purpose.