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This paper focuses on the V4-2007 extension of the Standard Test Data Format (STDF). STDF has been used as the standard representation for logging test data from automatic test equipment (ATE). This format however lacked a key capability, i.e., storing scan test results. The V4-2007 extension of this standard, as described in this paper, provides details on its ability in efficiently storing scan test results. Thus this standard now provides a complete and unified repository to store the results of parametric tests, functional tests and scan tests, all in a consistent format to aid in fault diagnosis and yield learning. This has in turn simplified the test flow and tracking of all necessary data to ensure more time-efficient testing and failure diagnosis.