What are the principal uncertainties (1) in the short term (for example, climate, demographic, economic, and political factors) and (2) in the long term (that is, after the first 10-20 years)?
Are the uncertainties the result of lack of data or lack of observations, or are they largely irreducible?
If the uncertainties can be reduced, how much effort and budget would be required to reduce these uncertainties?
Can decisions on the project be delayed until more information is gathered?
Is data collection obstructed by matters of national security or secrecy of another kind?
How do the uncertainties interact?
How might the various uncertainties (principal and minor) be weighted?
Are the uncertainties fairly well understood and quantifiable, or would they be better described as “deep”?
If trends in available data are discernible, what do the trends indicate, and how well do the historical trends match the projections?
Do the various stakeholders agree on the relative significance of the uncertainties?
Can a probability distribution be fitted to the uncertainties? Can they be modeled statistically?