EXCERPTS FROM GUIDING PRINCIPLES OF MONTE CARLO ANALYSIS,US EPA 1997 Selecting Input Data and Distributions Conduct preliminary sensitivity analyses x Evaluating variability and Uncertainty + Separate variability and uncertainty to provide greater accountability and transparency. x Presenting the Results Provide a complete and thorough description of the model.The objectives are transparency and reproducibility. Selecting Input Data and Distributions  Conduct preliminary sensitivity analyses  Evaluating Variability and Uncertainty  Separate variability and uncertainty to provide greater accountability and transparency.  Presenting the Results  Provide a complete and thorough description of the model. The objectives are transparency and reproducibility