Disc used to measure the relative importance of the three domains of the interview . Note: Two examples are shown. Left: this patient gave all three domains equal relative importance. Right: this patient gave the domains ‘factors of usability of OS’ and ‘communication and service’ almost equal relative importance, whereas the domain ‘opinion of others’ was considered to be less important. The score was measured from the second disc with the 100-point scale, which was placed around the circumference after the patient indicated to be satisfied with the result.