Open Access usage reporting is becoming ever more complex. Growing content syndication means that usage is occurring at scale across multiple platforms. While it's clear how this usage can be reported via COUNTER to libraries, it's less clear what other stakeholders are looking for, such as funders, editors, and authors. How granular should reporting be? Is there a role for geo-locating usage to help in organizational affiliation? What's the importance of human vs machine interfaces? And is all usage created equal, and does that matter? This session brings together four different perspectives: an OA publisher, an institutional funder, an open repository, and a vendor. We'll walk through what's known and then start to unpack the questions for which we don't yet have answers. Our goal is to inform our community understanding of the challenges ahead of us and, hopefully, start to lay the groundwork for future standards in this area.