Each capture records the top 30 positions on 24 Amazon US lists: Best Sellers and Hot New Releases for 12 coloring-book categories, 720 chart positions per capture. The categories also contain adjacent activity books. Each report states its capture date, any earlier capture it compares with, and its publication date; citations use the publication date.
A chart position is one listing at one rank on one list on one date. The same book can hold positions on several lists, so position counts are not counts of different books; reports say when they count distinct listings instead. Recent reports use whole-word title matches; earlier matching rules differ and are documented in each report. Groups can overlap, and displayed prices are capture-time prices with missing prices excluded.
Chart positions and displayed prices are observations of public lists. They do not establish sales, revenue, demand, or market share, and two captures cannot establish a lasting trend.