Which of the following is NOT a primary method of assessing existing products?

The choice of Internet research as the option that is not a primary method of assessing existing products makes sense because it typically serves a different purpose compared to the other methods listed.

Internet research usually involves gathering secondary data from existing sources, such as articles, reviews, and market analysis, rather than directly interacting with the product or its users. While it can provide valuable contextual information and insights into market trends, it lacks the direct hands-on evaluations or personal feedback that characterizes primary assessment methods.

In contrast, product testing involves evaluating a product's performance through empirical means, such as usability testing or quality assessments. User surveys provide direct feedback from consumers regarding their experiences and opinions, facilitating a deeper understanding of user satisfaction and areas for improvement. Interviews with users allow for in-depth discussions and insights that can uncover user needs and pain points, providing qualitative data that direct observations cannot fully capture.

Overall, each of the other methods—product testing, user surveys, and user interviews—focus on direct interaction and firsthand experience with the product or its users, making them more foundational approaches in assessing existing products compared to Internet research.