Catalog Quality Score (0–100) measures how completely and consistently a seller fills in their book listings. Points are awarded for author, publisher, and year fields being present, and for naming consistency across the catalog.

Inconsistency is penalized when a high proportion of publisher or author names appear only once — a signal of variant spellings for the same entity (e.g. "YKY" vs "Yapı Kredi Yayınları"). Sellers where the same publisher appears repeatedly score higher. Max is 55 pts for completeness and 40.5 pts for consistency.