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## 3.2 Verbalization

In the second analysis, the group discussions were recorded as protocols. The coordinator extracted the relevant topics of the discussions from the recorded protocols. The relevant topics are those on which the subjects discussed for more than five minutes. The nine extracted topics are listed in Table 3. Among them, five topics appeared in the part 1 discussion. They are related to the interpretation of the clusters, individual subjects' personalities, and the change arising from the granularity. The others appeared in the part 2 discussion. The subjects were interested in the interpretation of the switch objects and the secondary clusters. Discussion on the discrepancy among individual subjects' expectations and interpretations and the diagrams were hot throughout the discussions.

The answers to questions Q7 and Q8 are summarized in Table 4. The top three topics as ranked in Q7 are topics T3, T2, and T1. The topics that were extracted from the part 1 discussion were useful in helping the subjects verify the understanding of their preferences. Topics **T7, T8, and T9, which were extracted from the** part 2 discussion, were not selected at all. The subjects could be convinced that their understanding agreed with the others' if the clustering structure in the diagrams could be interpreted as easily as they expected.

The top three topics ranked in question Q8 were the topics T8, T9, and T7. The topics extracted from the part 2 discussion helped the subjects become aware of their preferences. The ranking of the topics from Q2 and Q1 becomes low while the ranking of the topics from Q3 is high both in Q7 and Q8. The subjects could become aware of their unconscious preferences by comparing the weak preference (the secondary cluster) with the strong preference (the primary cluster), and by attempting to verbalize the origin and background (the switch object) of the weak preference. Visualizing and verbalizing the weak preference in contrast to the strong preference contributes to becoming aware of the unconscious preference. The preference diagrams used in the part 2 discussion are more effective for this purpose. These are the first lessons learned in the experiments.

Next, the third analysis is demonstrated. Examples of the answers **to questions Q2 to Q4 are listed in Table**
5. Subjects nPID59 and nPID72 did not answer YES to question Q6 in Table 2. Subject nPID59 **discovered that the**
understandable degree of abstractness and warm colors are relevant as a motif. According to the protocols, the subject talked about the primary clusters in the coarser granularity preference diagrams. The subject particularly observed the technical details of the artworks in the primary cluster. This seems to be the reason why the subject