“…Prior work on long-term child-robot interaction has used various assessments to measure children's engagement and the robot's social presence, often using multiple-choice questionnaires or examining children's gaze, affect, and speech patterns, as well as several newer assessments that explicitly examined children's relationship with the robot through picture-based questions, disclosure, and interviews [37,41]. With regards to children's perception of the robot's animacy and human-likeness, prior work has primarily used questionnaires or interviews [24,36,47]; a few studies have also examined children's behavior, e.g., with a robotic dog versus with a stuffed dog [27]. In human-human studies, younger children's relationships have primarily been assessed through interviews or observational methods, such as coding children's behavior for different aspects of relationships such as disclosure, exclusivity, connectedness, conflict, and proximity [18,20,38,52,61].…”