Key takeaways
- Use IDIs for sensitive topics and senior or competing audiences.
- Use focus groups when group dynamics and reactions are the insight.
- Budget and timeline matter, but objectives should decide first.
Both methods deliver rich qualitative insight, but they answer different questions. Choosing the wrong one costs time and can hide the very thing you are trying to learn.
When to choose in-depth interviews
- The topic is sensitive, confidential, or commercially competitive.
- Participants are senior or hard to schedule together.
- You need to explore individual decision journeys in detail.
- Participants would influence each other in a group.
When to choose focus groups
- You want to observe how opinions form and shift in discussion.
- You are testing concepts, messaging, or creative.
- You need many perspectives quickly.
- The audience is consumer-like or peer-comfortable.
Budget and timeline
Groups are often cheaper per participant but harder to recruit for niche B2B profiles. IDIs cost more per head yet are easier to schedule. For specialist audiences, IDIs frequently turn out faster overall.
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