| IArcSineDistribution | Interface Arc Sine Distribution |
| IChiSquaredDistribution | Interface Chi-squared Distribution |
| ICurvilinearTrapezoidDistribution | Interface Curvilinear Trapezoid Distribution |
| IDistribution | Interface Distribution |
| IExponentialDistribution | Interface Exponential Distribution |
| IGammaDistribution | Interface Gamma Distribution |
| IInput | Interface Input |
| IInputDistribution | Interface Input |
| INormalDistribution | Interface Normal Distribution |
| IRandomChoicesFromSamples | Interface Random Choices From Samples |
| IRealUncNumber | Interface Real Unc Number. |
| IRealUncNumberT | Interface Real Unc Number. |
| IStandardNormalDistribution | Interface Standard Normal Distribution (mu = 0, sigma = 1) |
| IStandardUniformDistribution | Interface Standard Uniform Distribution (a = 0, b = 1) |
| IStudentTDistribution | Interface Student T Distribution |
| IStudentTFromSamplesDistribution | Interface Student T From Samples Distribution |
| ITrapezoidalDistribution | Interface Trapezoidal Distribution |
| ITriangularDistribution | Interface Triangular Distribution |
| IUncListT | Interface Uncertainty List |
| IUniformDistribution | Interface Uniform Distribution |
| DistributionType | Distribution Type |