1. A collaborative decision making system, comprising: a communication network; at least two user interfaces connected to said communication network; and a decision making process accessed by users via said user interfaces, said decision making process performed by an algorithm that operates to: identify a problem to be solved; identify a plurality of possible outcomes for said problem to be solved; structure said plurality of possible outcomes into a belief network; solicit evidence from said users relating to said outcomes; generate a probability table containing a conditional probability based on said evidence for each of the possible outcomes; and apply a selective weighting factor to said evidence based on the user that submitted the evidence to adjust the conditional probability for each of the possible outcomes.