Which primary marketing research technique is being used by this manager?

In-depth interviews are a qualitative research method focused on gaining deeper insights into individual respondents' thoughts and feelings. While this technique can provide rich, detailed information, it is not primarily aimed at gathering broad quantitative data like surveys, making it less suitable for generalizable marketing insights.

Behavioral observations involve watching consumers' actions in real time to understand their behaviors and interactions. This technique captures actual behavior rather than self-reported data and is typically qualitative. However, it does not systematically gather responses from a larger sample, which is a hallmark of survey research.

Social listening refers to monitoring online conversations and engagements to understand public perception and sentiment toward a brand or product. Although valuable for gathering insights from social media, this technique does not involve structured questioning like surveys do, thus lacking the targeted data collection aspect characteristic of survey research.