A manager is watching the faces of customers as they are trying a new product in the store. The manager takes notes on what is seen and plans on sharing the information with the team.

Social listening refers to monitoring online conversations and mentions of a brand or product across social media platforms. It is not applicable in the context of observing customer behavior directly in a physical store, as it focuses on digital interactions rather than live reactions.

Survey research involves collecting data through questionnaires or interviews to understand customer opinions, preferences, and behaviors. This method is less immediate and relies on self-reported data, rather than the direct observation of customer interactions with a product, which is what the manager is doing.

In-depth interviews are structured conversations aimed at exploring a participant's thoughts and feelings about a product or service. Though insightful, this method does not involve the spontaneous observation of customer reactions in a retail setting, which is the primary focus of the manager's activity.