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Edge Test Tool (ETT) Various ONC Certification Criteria In collaboration with ONC, NIST developed a tool to test requirements and standards related to message transport specifications expressed within the 2015/2014 R2 Editions of the ONC Standards & Certification Criteria. The tool, commonly referred to as the Edge Testing Tool (ETT), tests for adherence to the Edge Protocol standards during valid communication sessions between the ETT and a System Under Test (SUT).