This document discusses challenges and opportunities related to metadata for open access books. It notes that open access publications have no restrictions on licensing, digital rights, or costs, making their outputs immediately accessible and reusable. However, metadata for open access books faces issues including missing elements, inaccurate metadata, conversion needs, matching across sources, and lack of interoperability and reuse. This impacts discovery, usage metrics, and collection management. Opportunities include partnerships to improve publisher metadata, supporting infrastructure projects, and using open standards and mechanisms for metadata exchange.