It means we can design systems that do their job consistently and well, and it means we can take full advantage of the performance of the system.

For example, a well-designed system should have a well-defined and understandable interface. The interface should be self-documenting, and the contracts of the interfaces should be consistent, well-documented, and easily testable and verified.

When we engineer for system performance, we have to pay attention to the following:

• What are the unit tests?
• How do we ensure high quality?
• How do we ensure good design?
• How do we ensure good documentation?
• How do we test a system that has no GUI?
• How do we ensure good performance?
• How do we ensure good security?

These are some of the questions that we have to ask when we are developing a system and designing it for performance.