Which research method is specifically designed to collect in-depth information about people's opinions and experiences?

Interviews are a qualitative research method that allows for the collection of detailed insights into people's opinions and experiences. This method typically involves one-on-one conversations between the researcher and the participant, facilitating a deep exploration of thoughts, feelings, and motivations. During interviews, the researcher can ask open-ended questions, encouraging participants to elaborate on their answers and share personal stories, which yield richer and more nuanced data than many other methods.

In contrast, while surveys can provide valuable quantitative data, they often limit responses to predetermined options, which may not capture the depth of participants' feelings or thoughts. Focus groups involve discussions among a small group, which can lead to dominant voices overshadowing others and may not allow for in-depth exploration of individual experiences. Case studies provide an in-depth analysis of a particular instance but typically focus on specific contexts rather than gathering broad personal opinions from multiple individuals. Thus, interviews stand out as the method specifically designed for obtaining comprehensive insights into personal experiences and opinions.