User-Managed Access (UMA) is an award-winning OAuth-based protocol designed to give an individual a unified control point for authorizing who and what can get access to their digital data, content, and services, no matter where all those things live. Read the specs, join the group, check out the implementations, follow us on Twitter, like us on Facebook, get involved!
The UMA Roadmap for 2016 guided the use cases and technical issues that the Work Group focused on in its UMA2 effort. You can find other drivers in the Work Group's original compendium of Scenarios and Use Cases, its Case Studies page, and its User Stories page.
The short link for this page is http://tinyurl.com/umawg.