Methods for applying uncertainties
Posted: Thu May 14, 2026 9:04 am
What are the options for modeling uncertainty in Risky—empirical data or uncertainty bands? Are they alternatives?
- [Uncertainty bands,
- Low/High Duration settings with statistical distributions, or
- Manually entering low and high durations and setting the statistical distribution using the Statistical Distribution for Duration field which can be added as a column to Project View.
These approaches serve as alternative methods for defining uncertainty in activity durations.
Best Practices
- Use empirical data when you have historical project data you trust.
- Use uncertainty bands or distributions when data is limited or expert judgment is required.
- Maintain consistency across tasks—avoid mixing methods arbitrarily within the same project unless justified.
- Document your assumptions so results are defensible during reviews.