MIL-STD-31000B - All examinations, tests and inspections necessary to verify that an item meetsthe physical and functional requirements for which it was designed, to verify that a component, part orsubassembly will perform satisfactorily in its intended application, or that an item conforms to specifiedrequirements.

DAU - The process of determining that a computational model accurately represents the underlying mathematical model and its solution from the perspective of the intended uses of M&S.