You might also know this as PERT (https://de.wikipedia.org/wiki/Program_evaluation_and_review_technique https://de.wikipedia.org/wiki/Program_evaluation_and_rev

You might also know this as PERT (https://de.wikipedia.org/wiki/Program_evaluation_and_review_technique https://de.wikipedia.org/wiki/Program_evaluation_and_review_...) I used it in the past and I think it is a good framework to discover uncertainty and make it more visible, because it makes you talk about optimistic and pessimistic cases. The estimates are also good enough to come up with a draft schedule.