  Society is showing signs of strong ideological polarization. When pushed to
seek perspectives different from their own, people often reject diverse ideas
or find them unfathomable. Work has shown that framing controversial issues
using the values of the audience can improve understanding of opposing views.
In this paper, we present our work designing systems for addressing ideological
division through educating U.S. news consumers to engage using a framework of
fundamental human values known as Moral Foundations. We design and implement a
series of new features that encourage users to challenge their understanding of
opposing views, including annotation of moral frames in news articles,
discussion of those frames via inline comments, and recommendations based on
relevant moral frames. We describe two versions of features -- the first
covering a suite of ways to interact with moral framing in news, and the second
tailored towards collaborative annotation and discussion. We conduct a field
evaluation of each design iteration with 71 participants in total over a period
of 6-8 days, finding evidence suggesting users learned to re-frame their
discourse in moral values of the opposing side. Our work provides several
design considerations for building systems to engage with moral framing.
