  In this paper, we investigate how to elicit new perspectives in
research-through-design (RtD) studies through annotated portfolios. Situating
the usage in human-robot interaction (HRI), we used two robotic artefacts as a
case study: we first created our own annotated portfolio and subsequently ran
online workshops during which we asked HRI experts to annotate our robotic
artefacts. We report on the different aspects revealed about the value, use,
and further improvements of the robotic artefacts through using the annotated
portfolio technique ourselves versus using it with experts. We suggest that
annotated portfolios - when performed by external experts - allow design
researchers to obtain a form of creative and generative peer critique. Our
paper offers methodological considerations for conducting expert annotation
sessions. Further, we discuss the use of annotated portfolios to unveil
designerly HRI knowledge in RtD studies.
