Validation
Validation is a fairly precise term in the systems engineering world that means testing the product against the documentation from which it was produced.
Validation answers the question; Did we build the right system?
A product validation verifies that the product operates according to the expressed product requirements.
It may be a very good product but unless it does what it was intended to do then it is not validated.
The implication of this is that if you do not write down the requirements for a system then there is no way to say that it is a quality product or not.
Validation only has meaning in the context of prewritten requirements.
During requirements analysis a test plan is developed which sets expectations about the scope of testing required for the product.
As the requirements are concluded Test cases account for each requirement.
The test cases are developed with test steps that set up an initial condition, perform some required operation then use some means to verify that the step completed correctly.
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