INSEPARABLE ASSEMBLY INFRARED BRAZING (IRB) A brazing process in which the heat required is furnished by infrared radiation. INHERENT TESTABILITY A testability measure that is depen- dent only upon hardware design and is independent of test stimulus and response data. INHERENT VALUE A measure of maintainability that includes only the effects of item design and application and assumes an ideal operation and support environment. INHIBITOR A chemical substance or combination of substances that, when present in the proper concentration and forms in the environment, prevents or reduces corrosion by a physical, physical- chemical, or chemical action. INITIAL GRAPHICS EXCHANGE SPECIFICATION (IGES) A neutral file format for the representation and transfer of product definition data among CAD/CAM systems and application pro- grams. INITIAL POINT The point relative to which all pels are positioned within a page. It does not necessarily lie at a corner of a tile in the