Specifies a test description language that: a) Defines format, pattern and timing information sufficient to define the application of digital test vectors to a device under test (DUT); b) Aids the transfer of large quantities of digital test vector data from CAE environments to automated test equipment (ATE) environments; c) Supports the volume of test vector data generated from structured tests such as scan/automatic test pattern generation (ATPG), integral test methods such as built-in self test (BIST), and functional test specifications for IC designs and their assemblies, in a format optimized for application in ATE environments.