Verification and validation

Testing isn’t just about checking that a system fulfills its requirements, user stories, or other specifications; it is also about ensuring that the product fulfills the wishes and expectations of its users in a real-world environment. In other words, checking whether it is possible to use the system as intended and making sure it fulfills its planned purpose. Testing therefore also involves validation (see Principle #7 in section 2.1.6—“Absence-of-errors is a fallacy”).