The TSCA Interagency Testing Committee (ITC) in its 38th Report to EPA revised the Toxic Substances Control Act (TSCA) Section 4(e) Priority Testing List by recommending for testing 18 chemical substances. The ITC recommendations must be given priority consideration by EPA in promulgating test rules. EPA is adding certain of these chemical substances to two model information-gathering rules: the TSCA Section 8(a) Preliminary Assessment Information Rule (PAIR) and the TSCA Section 8(d) Health and Safety Data Reporting Rule. These model rules will require manufacturers and importers of the substances identified herein to report certain production, use, and exposure- related information, and manufacturers, importers, and processors of the listed substances to report unpublished health and safety data to EPA.