What is a common tool used in the criteria for testing and comparing products?

A common tool used in the criteria for testing and comparing products is questionnaires. These tools are essential for gathering feedback directly from users or consumers regarding their experiences, preferences, and perceptions of different products. By utilizing questionnaires, designers and marketers can assess various aspects such as usability, aesthetics, functionality, and overall satisfaction. This quantitative and qualitative data allows for a structured comparison of products based on user feedback, which is crucial in evaluating their success and identifying areas for improvement.

Market conditions reports and customer demographic studies are more focused on understanding the broader context of the market and target audience rather than directly evaluating specific products. Financial profitability analysis is primarily concerned with the economic aspects of product performance, such as cost and revenue, rather than user experience. Therefore, while these tools provide valuable insights, they do not serve the primary purpose of testing and directly comparing product performance as effectively as questionnaires do.