A tying arrangement is an agreement by a party to sell one product (the tying product) but only on the condition that the buyer also purchases a different product(the tied product). However in technologically-dynamic markets it is often difficult to determine if a bundle of goods is one product or more. The best-known example of such a bundle is Microsoft's Windows-Internet Explorer package. We needed the test for deciding a bundle product is whether one integrated product or two tied products. A test for deciding bundle is whether one or two is depend on consumer interest(the Jefferson Parish rule). In other words, one integrated product has need to combined functionalities in a way that offers advantages unavailable if the functionalities are bought separately and combined by the consumer. That is to say a per se rule is inappropriate because tying can have both pro-and anticompetitive effects. A clearly structured rule-of-reason test is the proper solution to the separate-product problem. This test should accurately differentiate pro-from anticompetitive tie-ins and should be judicially manageable.