Abstract: The invention consists in a computer network based method for rating persons who rate rateable factors. The method comprising the steps of providing a reward to a person making a rating of a rateable factor. The quantum of the reward is adjusted according to at least one criteria, which may be at least one of, promptness of the submission of the rating, to what extent the persons rating deviates from the average rating by other persons to the same rateable factor, and to what extent that persons rating deviates from the average rating of similar rateable factors in the past.