This scale, of 14 items, is the short version of the 40 items trust perception scale-HRI.

While use of the 40 items scale is recommended, a 14 items subscale can be used to provide rapid trust measurement specific to measuring changes in trust over time, or during assessment with multiple trials or time restrictions. This subscale is specific to functional capabilities of the robot, and therefore may not account for changes in trust due to the feature-based antecedents of the robot. 
Trust score is calculated by first reverse coding the "have errors", "unresponsive", and "malfunction" items, and then summing the 14 item scores and dividing by 14.


Reference:  Schaefer, K. E. (2016). Measuring trust in human robot interactions: Development of the “trust perception scale-HRI”. In Robust intelligence and trust in autonomous systems (pp. 191-218). Boston, MA: Springer US. https://d1wqtxts1xzle7.cloudfront.net/114178129/978-1-4899-7668-020240505-1-agu5dz-libre.pdf?1714934405=&response-content-disposition=inline%3B+filename%3DRobust_Intelligence_and_Trust_in_Autonom.pdf&Expires=1720525011&Signature=GiwTFX8RVqIoZ0hbY~O4fmCLoHrC4Zk6y-yviwJvsGZKm2pg7HiR3BNPjcyV4ROsD7TmigLEFsXIXf8UppjDyCRJWrbqyAFgpogdMr21TAWd9JakETZoju5qsSh8qgpmCQdR19PUJbtnb~DgcEdW7JpjjAYoY5A7h7aNXz97kUS0iHpRZaG-~1~ez4K82~5arEkL016b1QQUaaqk9Kk4A~j4qKbHg3fUST60QOKxwtzju1MQOscVJLX882NQmG03rhZ1jqAzb6VG4OnTjQL2hQP1eegcQk4j6TF1fTp0Q9idZo9LdQ7eq6yPro-8nCluVQ6w3bVUBc-45HPs43IjLg__&Key-Pair-Id=APKAJLOHF5GGSLRBV4ZA#page=198