Introduction to Software Testing

Understanding

• The safety features designed for the boilers did not work as well as predicted because they were not based on scientific understanding of the causes of accidents.
• Something that sounds good isn’t necessarily a good idea. You need to develop a deep understanding.

A good idea in one field is not necessarily good in another field

• For example, consider N-modular hardware redundancy:
• Use N identical hardware components in the same role. If they always agree, fine. If not, take a vote.
• This is a highly-trusted engineering design principle for safety-critical hardware systems.