two measurements are used. One is the number of responders in the top decile (top 10%); in the above example, 410. This reflects the ability to locate a small number of highly likely buyers. The other is the total number of responders in the top 4 deciles (top 40%); in the above example, it is 410+190+130+76 = 806. This reflects the ability to locate a large number of likely responders in a larger rollout. These two measurements are used separately in evaluating data mining tools in the KDD-97-Cup Competition.