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Over the years, several technical testing procedures have been developed to support registry services. Previously, all registry-related technical tests were referred to as Pre-Delegation Testing (PDT). To more accurately reflect the portfolio of registry test services performed for delegated top-level domains, these services will now be collectively referred to as Registry System Testing (RST), which includes Pre-Delegation Testing.
The published information can now be accessed at https://www.icann.org/resources/registry-system-testing.