What are the testing principles the software engineer must apply whereas performing the software testing?

i. All tests should be traceable to customer requirements.

ii. Tests should be planned long before testing starts.

iii. The Pareto principle can be applied to software testing-80% of all errors uncovered during testing will likely be traceable to 20% of all program modules.

iv. Testing should start "in the small" and progress toward testing "in the large".

v. Exhaustive testing is not possible.

vi. To be most effective, an independent third party should conduct testing.