Wrong, incomplete or inaccurate metadata affects the performance of system-based library operations and the services libraries propose to library patrons. Using concrete examples, we will present the day-to-day difficulties librarians and library users encounter due to poor quality metadata and their impact on access, decision making and discovery. This session will contribute to the general discussion about poor quality metadata, aiming to illustrate how important it is for the publishing and library community to have a good set of metadata for electronic resources circulating in the supply chain. Magaly Bascones, Jisc Amy Staniforth, Aberystwyth University