1. A method executed by a computer system for determining a correctness score for a value proposed for an attribute of a map feature, the method comprising: receiving from a user a proposed value for the attribute of the map feature; determining for the user a first score indicative of a probability that the user provides intentionally incorrect values, the first score based on a plurality of stored interactions of the user with a map editing service; determining for the user a second score indicative of a probability that the user provides accurate values; determining for the proposed value a third score indicative of a probability that the proposed value is an intentionally incorrect value; determining for the proposed value a fourth score indicative of the probability that the proposed value is correct based on the first, second and third scores; determining a popularity of the map feature; responsive to the fourth score exceeding a threshold, accepting the proposed value for the attribute of the map feature, wherein the threshold is higher if the popularity of the map feature is higher; and wherein the first, second and third scores are determined separately from eachother.