From this link I assert that a feature is a set of backlog items, but what is an epic supposed to be?
The general consensus is that:
- Product backlog Item is something that can be delivered in a single sprint.
- Feature is something that can't be delivered in a single sprint, but that can be delivered in a single release.
- Epic is something that transcends releases.
- Theme is a cross cutting concern.
Theme is generally implemented as a tag in TFS and VSTS.
This is a practice that is in line with Scrum Framework, Nexus Framework, and SAfE methodology.
ds19
From this link:
"Epics are hierarchically above Features. Features are mapped to Epics, like Backlog items are mapped to Features"
来源：https://stackoverflow.com/questions/30569136/what-are-epics-in-regard-of-features-and-backlog-items-in-team-foundation