This document discusses solutions for managing identity at scale. It begins by describing trends like cloud computing, mobile devices, and the internet of things that are increasing the need for identity management. It then examines challenges like maintaining metadata across many connections. Two proposed solutions are a proxy that manages connections indirectly, and a metadata service that allows centralized management of metadata. The document recommends a metadata service approach that supports multiple protocols and can combine with proxy solutions for different deployment scenarios. This would help scale identity management to a global level.