RADAR-X: An Interactive Interface Pairing Contrastive Explanations with
  Revised Plan Suggestions
  Empowering decision support systems with automated planning has received
significant recognition in the planning community. The central idea for such
systems is to augment the capabilities of the human-in-the-loop with automated
planning techniques and provide timely support to enhance the decision-making
experience. In addition to this, an effective decision support system must be
able to provide intuitive explanations based on specific queries on proposed
decisions to its end users. This makes decision-support systems an ideal
test-bed to study the effectiveness of various XAIP techniques being developed
in the community. To this end, we present our decision support system RADAR-X
that extends RADAR (Grover et al. 2020) by allowing the user to participate in
an interactive explanatory dialogue with the system. Specifically, we allow the
user to ask for contrastive explanations, wherein the user can try to
understand why a specific plan was chosen over an alternative (referred to as
the foil). Furthermore, we use the foil raised as evidence for unspecified user
preferences and use it to further refine plan suggestions.
