Definition
A focus group is a moderated discussion with a small, homogeneous group of participants to explore perceptions, opinions, and attitudes about a topic. An expert panel gathers specialists to provide informed evaluation or consensus on complex issues.

Introduction
Human ideas often sharpen through conversation. Focus groups capture that social interaction, revealing not only what people think but why they think it. Unlike individual interviews, group dynamics encourage participants to react to one another, generating insights that rarely surface in isolation.

Explanation
A typical focus group involves six to ten participants guided by a trained moderator. Questions are open-ended, moving from broad topics to specifics while allowing natural dialogue. The moderator’s skill is critical—too rigid, and discussion stalls; too loose, and it derails.
The method is especially powerful in exploratory marketing and social research—testing new products, advertisements, or policies before large-scale rollout. Expert panels, by contrast, involve professionals debating technical or policy matters where lay discussion would lack depth. The Delphi technique, for example, gathers expert opinions anonymously through multiple rounds until consensus emerges.

However, focus groups may be influenced by dominant personalities or social desirability bias. Diversity in composition and neutral moderation reduce these effects.

Key Takeaways
Focus groups reveal collective reasoning and emotional undertones behind choices, while expert panels harness domain knowledge for judgment and forecasting.

Real-World Case
Before introducing its global “Share a Coke” campaign, Coca-Cola ran focus groups across continents to test emotional responses to personalized bottles. Feedback helped refine message tone and packaging, leading to one of the brand’s most successful promotions.
Reference: https://www.coca-colacompany.com