EPA is amending the Toxic Substances Control Act (TSCA) section 8(a) Inventory Update Reporting (IUR) rule and changing its name to the Chemical Data Reporting (CDR) rule. The CDR enables EPA to collect and publish information on the manufacturing, processing, and use of commercial chemical substances and mixtures (referred to hereafter as chemical substances) on the TSCA Chemical Substance Inventory (TSCA Inventory). This includes current information on chemical substance production volumes, manufacturing sites, and how the chemical substances are used. This information helps the Agency determine whether people or the environment are potentially exposed to reported chemical substances. EPA publishes submitted CDR data that is not Confidential Business Information (CBI). EPA is amending this rule to require submission of information that will better address Agency and public information needs, improve the usability and reliability of the reported data, and ensure that data are available in a timely manner. EPA is requiring electronic reporting of CDR information and modifying reporting requirements, including certain circumstances that trigger reporting, the specific data to be reported, the reporting standard for processing and use information, and CBI reporting procedures.