  Persuasive social robots employ their social influence to modulate children's
behaviours in child-robot interaction. In this work, we introduce the
Child-Robot Relational Norm Intervention (CRNI) model, leveraging the passive
role of social robots and children's reluctance to inconvenience others to
influence children's behaviours. Unlike traditional persuasive strategies that
employ robots in active roles, CRNI utilizes an indirect approach by generating
a disturbance for the robot in response to improper child behaviours, thereby
motivating behaviour change through the avoidance of norm violations. The
feasibility of CRNI is explored with a focus on improving children's
handwriting posture. To this end, as a preliminary work, we conducted two
participatory design workshops with 12 children and 1 teacher to identify
effective disturbances that can promote posture correction.
