INTERVIEW QUESTION:

What are the four fundamental methods of requirement verification?


The four fundamental methods of verification are Inspection, Demonstration, Test, and Analysis.  The four methods are somewhat hierarchical in nature, as each verifies requirements of a product or system with increasing rigor.  I will provide a description of each with two brief examples of how each could be used to verify the requirements for a car and a software application.

Inspection is the nondestructive examination of a product or system using one or more of the five senses (visual, auditory, olfactory, tactile, taste).  It may include simple physical manipulation and measurements.

Demonstration is the manipulation of the product or system as it is intended to be used to verify that the results are as planned or expected.

Test is the verification of a product or system using a controlled and predefined series of inputs, data, or stimuli to ensure that the product or system will produce a very specific and predefined output as specified by the requirements.

Analysis is the verification of a product or system using models, calculations and testing equipment.  Analysis allows someone to make predictive statements about the typical performance of a product or system based on the confirmed test results of a sample set or by combining the outcome of individual tests to conclude something new about the product or system.  It is often used to predict the breaking point or failure of a product or system by using nondestructive tests to extrapolate the failure point.

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Chris Adams
LinkedIn Profile

posted @ Saturday, November 7, 2009 3:08 PM by Chris Adams