Which of the following is considered a qualitative research method?

Depth interviews are a qualitative research method because they involve in-depth, open-ended discussions that allow researchers to gather detailed insights into participants' thoughts, feelings, motivations, and experiences. This method emphasizes understanding the nuances of individual perspectives and often explores complex topics that cannot be quantified easily. It encourages participants to express themselves in their own words, providing rich, qualitative data.

In contrast, online surveys typically collect quantitative data by using structured questions that can be statistically analyzed. Usability testing focuses on evaluating how real users interact with a product, often yielding qualitative feedback but primarily measuring user behavior through specific tasks. Analytics review relies on quantitative data from user interactions and site metrics, providing insights based on numerical data and trends rather than personal narratives. These distinctions clarify why depth interviews stand out as a qualitative method, focusing on the depth of human experience rather than the breadth of data.