Every 1–5 score in the dataset is assigned using a published rubric with labeled tiers, definitions, diagnostic questions, and historical examples. Scores are absolute — a "3" means the same thing in 500 BCE and 1900 CE. Era-relative context (how exceptional a score is for its time) is computed at display time so users can see both the absolute level and the percentile ranking.
How formal and structured is the state's administrative machinery?
How codified and consistently applied is the legal system?
How secure and continuous is the political order?
How significant is this entity in regional and global trade networks?
How advanced are financial instruments and institutions?
How possible is it for individuals to change economic class?
What degree of legal and social agency do women hold?
How rigid is the social hierarchy? (Note: higher = more rigid)
How widely available is formal education?
How prolific and influential is the civilization's cultural production?
What is the overall level of applied technology?
How advanced is the practice of medicine?
What level of mathematical knowledge and application?
How professionalized and capable is the military?
How far does this entity's diplomatic network extend?
How severe are external military threats? (Higher = more danger)