A method of testing mailing lists, in which one starts with a small quantity and, based on positive indications, follows with increasingly larger quantities of the list balance until the entire list is mailed.

This is a mailing-list testing technique that involves selecting and mailing progressively larger samples from a list until the total list is mailed as long as the revenue from each mailing exceeds the costs. This eliminates the risk of mailing large volume of pieces to an unprofitable list.