A computer implemented method of valuing and modeling an investment comprising the steps of: providing at least one investment for consideration comprised of at least one future cash flow; creating at least one probability distribution for each future cash flow, by a user, each probability distribution to represent uncertainty of magnitude at at least one particular time to provide at least one magnitude distribution; creating at least one probability distribution for each future cash flow, by a user, each probability distribution to represent uncertainty of timing at at least one particular magnitude to provide at least one timing distribution; combining the magnitude distributions and at least one timing distribution into at least one joint-probability distribution function; and converting at least one joint-probability distribution function to generate a two-dimensional net present value probability distribution.