Computer components includes software and hardware. The (1.). tells the hardware what to do and the (2.). executes the commands. (3.). are defined to ensure that components meet technical and quality requirements. The (4.). identifies the identities and versions of components under test and test specification. (5.) are dev ces which are used to measure attributes of physical systems, which may includes power, current temperature, density, voltage, inductance, capacita nce and others.​