Delphi technique (8/8)
+ Maintain attention directly on the issue
+ Allow diverse background and remote locations
+ Produce precise documents
- Laborious, expensive, time-consuming
- Systematic errors
- Discounting the future (current happenings seen as more important)
- Illusory expertise (expert may be poor forecasters)
- Vague questions and ambiguous responses
- Simplification urge
- Desired events are seen as more likely
- Experts too homogeneous ? skewed data