1 Subjects: “...importance‒performance analysis...”

2 Subjects: “...keywords analysis...”

3 Subjects: “...qualitative analysis...”

4 Subjects: “...multiple-criteria decision analysis...”

5 Subjects: “...4C2S analysis framework...”

6 Subjects: “...life-cycle analysis...”

7 Subjects: “...correlation analysis...”

8 Subjects: “...international comparative analysis...”

9 Subjects: “...keyword network analysis...”

10 Subjects: “...keyword network analysis...”

11 Subjects: “...ambient behavioral analysis...”

12 Subjects: “...cross-country analysis...”