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Users of spreadsheets are often working under the assumption that facts and figures employed are well known and certain. This might be an issue when it comes to planning – so how to incorporate risk and uncertainty in a spreadsheet analysis? Ozzie Gooen has seemingly developed an answer to this – Guesstimate features upper and lower boundaries for values used within specific analyses. It works with confidence intervals and probability distributions that allow its user to work with uncertain “facts, going beyond mere best and worst case scenarios.