Analysis An element of verification that uses established technical or mathematical models or simulations, algorithms, charts, graphs, circuit diagrams, or other scientific principles and procedures to provide evidence that stated requirements are met.
Demonstration An element of verification that involves the actual operation of an item to provide evidence that the required functions are accomplished under specific scenarios.  The items may be instrumented and performance monitored.
Inspection An element of verification that is generally non-destructive and typically includes the use of sight, hearing, smell, touch, and taste; simple physical manipulation; and mechanical and electrical gauging and measurement.
Test An element of verification in which scientific principles and procedures are applied to determine the properties or functional capabilities of an item.