Internet shops enable customers to easily compare a large number of products. During their buying decision, customers apply decision strategies which describe their way of choosing their preferred product. In order to support the customers, Internet shops offer interactive decision aids like sorting or filtering mechanisms. This paper answers the question, which types of interactive decision aids are necessary to apply specific decision strategies. Based on the analysis, web designers are advised to offer those decision aids that go best with the most commonly used decision strategies and make decisions easier and more precise.