This is always a question I come accross when starting a new project: How to approach the stakeholder(s)? I tend to vary, according to my knowledge of the person, from formal to relaxed, but always maintaining a high level of professionalism.
This article by Steve Baty offers several guidelines on how to conduct a successful interview with with project stakeholders, that include:
- Leave at least 30 minutes between interviews
- Limit an interview to just three or four major topics
- Talk about culture, challenges, and goals, not features
- Be prepared for your interviews
Worth a read.