Abstract: One aspect provides a computer system for processing data on returned products, by receiving returns data on purchased products returned for a refund; and determining predicted return data for a product sold in the future based on the returns data for the product purchased in the past. Another aspect provides a computer system for receiving customer selection data for a product that the customer proposes to one of purchase and refund, the customer selection data including data identifying the customer and the product; accessing returns data using at least one of the data identifying the customer and the data identifying the product, the returns data indicating at least one of a customer's propensity to return products and a propensity of the product to be returned; and generating a customer interface dependent upon on the returns data for one of the proposed purchase and the proposed refund.