  A number of groups, from governments to non-profits, have quickly acted to
innovate the contact-tracing process: they are designing, building, and
launching contact-tracing apps in response to the COVID-19 crisis. A diverse
range of approaches exist, creating challenging choices for officials looking
to implement contact-tracing technology in their community and raising concerns
about these choices among citizens asked to participate in contact tracing. We
are frequently asked how to evaluate and differentiate between the options for
contact-tracing applications. Here, we share the questions we ask about app
features and plans when reviewing the many contact-tracing apps appearing on
the global stage.
