KBART (Knowledge Bases And Related Tools) is a recommended practice for publishers to provide standardized metadata to knowledge bases to improve the accuracy of holdings information. Phase 1 focused on serials while Phase 2 expanded the scope to ebooks, open access resources, and consortial holdings. The KBART standing committee oversees the recommended practice. Knowledge bases aggregate holdings data to support linking, discovery, and electronic resource management. Inaccurate holdings data in knowledge bases can negatively impact these services. KBART provides guidelines for data formatting and delivery, educational materials, and an endorsement program to recognize compliant publisher data feeds. Current priorities include increasing adoption of KBART best practices.