Abstract: A system for determining whether items of evidence prove a conclusion based upon user input data. The software of the present invention interrogates a user to receive characteristic information about the user and for information about the items of evidence in a trial. In accordance with the present invention, a user inputs a probability for each item of evidence that the item of evidence is true and a probability that the item of evidence proves a conclusion. The software of the present invention then calculates the probability that each item of evidence individually proves the conclusion and the probability that all of the items of evidence combined prove the conclusion. The software of the present invention than performs statistical analysis of the data receive from several users to determine trends about the evidence and to model a jury or to select a jury from a pool of potential jurors.