Inspection is the non-destructive examination of a product or system. It may include simple physical manipulation and measurements. This is generally used to verify physical design features.
Analysis is the use of mathematical modelling and analytical techniques to predict the compliance of a design to its requirements based on calculated data or data derived from system or subsystem testing.
Demonstration is the use of component, subsystem, or system operation to show that a requirement can be achieved by the system. It is generally used for a basic confirmation of performance capability and is differentiated from testing by the lack of detailed data gathering. Often, other verification methods will be used in support of demonstration.
Test is the use of component, subsystem, or system operation to obtain detailed data to verify performance or to provide sufficient information to verify performance through further analysis.