“…The finding that politeness was less of a concern in expert situations than in general service situations (Experiment 1 in this study, Inbar and Meyer, 2019;Rea et al, 2021) indicates that the robot design of politeness should be more effective in general service situations than in expert situations. As studies proposing personalize agents' politeness levels according to each participant (Firdaus et al, 2022;Smith et al, 2022), participants' demographic differences (e.g., age and gender) may affect politeness impressions (Jucks et al, 2018;Kumar et al, 2022;Miyamoto et al, 2019;Rana et al, 2021;Zhu andKaber, 2012, but not observed in Inbar andMeyer, 2015;Inbar and Meyer, 2019;Lee et al, 2019). As this study did not aim to investigate demographic differences, we did not control the numbers of male and female participants and participants' ages, but conducted a posteriori analysis regarding gender differences.…”