You can select the statistical distribution for the duration to be used in the probabilistic calculations. Distribution can be Undefined, Normal, Lognormal, Uniform, and Triangular. Undefined distribution means that Low Duration and High Duration is ignored, and duration is Base in all iterations. If low, base, and high default durations are the same, distribution is set to Undefined. In other cases, default distribution is Triangular. For more information, see “How to define distribution for Start Time, Cost, Income, and Duration”.