Modern news aggregators do the hard work of organizing a large news stream,
creating collections for a given news story with tens of source options. This
paper shows that navigating large source collections for a news story can be
challenging without further guidance. In this work, we design three interfaces
-- the Annotated Article, the Recomposed Article, and the Question Grid --
aimed at accompanying news readers in discovering coverage diversity while they
read. A first usability study with 10 journalism experts confirms the designed
interfaces all reveal coverage diversity and determine each interface's
potential use cases and audiences. In a second usability study, we developed
and implemented a reading exercise with 95 novice news readers to measure
exposure to coverage diversity. Results show that Annotated Article users are
able to answer questions 34% more completely than with two existing interfaces
while finding the interface equally easy to use.

本研究设计了三个接口 —— 注释文章、重新组合文章和问题网格 —— 旨在帮助读者发现新闻报道的多样性，第一次可用性研究表明这些设计的接口都展现了报道的多样性，并确定了每个接口的潜在用例和受众，第二次可用性研究表明，相较于现有的两个接口，注释文章接口的用户能够更全面地回答问题，同时发现该接口易于使用。