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| Main category | Subcategory | Primitive category |
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| C1 teaching information | M1 curriculum information | B1 course flow arrangement |
| B2 fragmentation of course time |
| B3 teaching time |
| M2 course content information | B4 sequence of content arrangement |
| B5 the difficulty of course content |
| B6 the content is clear |
| B7 syllabus |
| B8 course content system |
| M3 course service information | B9 course supporting services |
|
| C2 teacher and student information | M4 teacher information | B10 teacher’s experience |
| B11 teaching methods |
| B12 teacher qualification |
| B13 teacher style |
| B14 teacher’s detailed introduction |
| B15 teachers’ conduct |
| M5 excellent student information | B16 excellent students |
|
| C3 perceived risk | M6 time risk | B17 waste time |
| M7 physical risk | B18 care for children’s eyes |
| M8 study risk | B19 children do not like it |
| B20 bad learning effect |
| B21 bad learning result |
| M9 system risk | B22 system delete |
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| C4 perceived cost | M10 sunk cost | B23 waste money |
| M11 cost performance | B24 focus on cost performance |
| M12 price affordability | B25 affordable price |
| B26 beyond affordability |
| M13 spend money on learning | B27 courses need to be paid |
| M14 high curriculum fees | B28 high price |
| M15 charging frequency | B29 charging interval |
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| C5 recommendations from people around | M16 teacher’s recommendation | B30 teacher’s recommendation |
| M17 parents’ recommendation | B31 recommended by parents communication group |
| B32 recommended by parents |
| B33 parents’ meeting consultation |
| M18 recommended by friends | B34 recommended by friends |
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