Module 7 - Faults and Failures

Question 1

What is a fault?

Answer 1

The inability to perform as required due to internal state

Question 2

What is a failure?

Answer 2

The loss of ability to perform as required

Question 3

What is random hardware failure?

Answer 3

Failure occurring at a random time resulting from hardware degradation mechanisms

Question 4

What is systematic failure?

Answer 4

Failure related to a pre-existing fault which consistently occurs under specific conditions and only rectified through manual intervention

Question 5

Why is the distinction between random and systematic faults important?

Answer 5

To achieve safety, both random and systematic faults must be minimised. The techniques used to treat each are different. We use quantitative measures for random faults, and techniques and measures for systematic faults.

Question 6

What are the two basic techniques to deal with faults?

Answer 6

1. Fault avoidance

2. Fault detection preventing failure