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Customer-Centered Design: A New Approach to Web Usability by Karen Hyatt, Kreta Chandler

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Sales Data and Other Relevant Measures

For existing websites, sales data and trends—such as units sold, category growth percentages, or market share of a product in a category—are data points to consider for benchmarking. These can tell you if an implementation is working or not. It's important to factor in seasonality or cyclical factors and other influences, such as the state of the economy, and then to be able to measure the success of the changes or recommendations.

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