Triangular Distribution
In addition to the Beta distribution, project management tradition has also favored the triangular distribution, which as its name suggests is in the shape of a triangle. Again, the user specifies optimistic, most likely, and pessimistic values. (Either the optimistic or the pessimistic can be the same as the most likely, to create a right-angled triangle.) It is hard to imagine that this is an accurate representation of many natural processes, though it is the distribution of the sum of two uniformly distributed variables.
Uniform Distribution
That brings us to the uniform distribution, which just looks like a rectangle. Every value between the optimistic and pessimistic values is equally likely. It is the correct distribution for the time you have to wait for a bus, given that you arrive at some random time and you don’t know the schedule.
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