# Classifier **Domain:** Machine learning / Decision systems **Doc Type:** Developed Wiki Node **Maturity:** Developed **Collection:** [[collections/Gamification|Gamification Collection]] ## Definition A **classifier** is a system that assigns an observation to one or more categories using rules, statistical models, or learned representations. ## Significance In eligibility and security systems, classification becomes consequential when a category controls access, sanction, scrutiny, or future options. ## Sources - [[articles/gamification/Lex Sportiva and Winning Without Bloodshed|Lex Sportiva and Winning Without Bloodshed]] - [Primary or institutional source](https://developers.google.com/machine-learning/crash-course/classification) ## Routes [[wiki/Cost Matrix|Cost Matrix]] · [[wiki/False Positive|False Positive]] · [[wiki/Eligibility Regime|Eligibility Regime]] · [[articles/gamification/Lex Sportiva and Winning Without Bloodshed|Lex Sportiva and Winning Without Bloodshed]]