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(BIT) Similar to BIST in that it performs test of the circuit it resides in, but it is generally used at board and system levels and often uses extra hardware, software, and/or firmware to implement the test. When the added circuitry is substantial, it may be called embedded test. If BIT is implemented in software, it is called BIT software.
See also: Built-In Self-Test.
Source: A proposed definition from the Testability Management Action Group.