Nitpicks, the term you want when you've been using "standard deviations" is either: Distribution - general term for the shape of the relationship between proba

Nitpicks, the term you want when you've been using "standard deviations" is either: Distribution - general term for the shape of the relationship between probability and task length. Triangular distribution or PERT - the specific shape of least/greatest/most likely you are using Risk or Probability - the general concept that things are not definite and involve chance. And where you are using "Total" for each item, you want "Mean" or "Median" depending which it is. And I don't care to know the total mean or median time for scheduling, because the project will exceed that time 50% of the time (if it's the median, more if it's mean with long-tailed distributions) I would instead want some high quantile such that the chances of exceeding the schedule/budget are low (and which quantile I pick depends on my project, what's at risk if the schedule is exceeded).