  In this paper we investigate the influence interfaces and feedback have on
human-robot trust levels when operating in a shared physical space. The task we
use is specifying a "no-go" region for a robot in an indoor environment. We
evaluate three styles of interface (physical, AR, and map-based) and four
feedback mechanisms (no feedback, robot drives around the space, an AR "fence",
and the region marked on the map). Our evaluation looks at both usability and
trust. Specifically, if the participant trusts that the robot "knows" where the
no-go region is and their confidence in the robot's ability to avoid that
region. We use both self-reported and indirect measures of trust and usability.
Our key findings are: 1) interfaces and feedback do influence levels of trust;
2) the participants largely preferred a mixed interface-feedback pair, where
the modality for the interface differed from the feedback.
