1. A computer implemented method of making a decision through modeling said decision, said method comprising the steps of: providing a first decision for consideration on a computer, wherein said first decision is comprised of at least one future cash flow; providing at least one image on a computer screen to a user from a library of images; selecting an image for each said future cash flow, by said user on said computer, to represent uncertainty of magnitude at least one particular time to provide at least one magnitude distribution; selecting an image of distribution for each said future cash flow, by said user, to represent uncertainty at least one particular time to provide at least one timing distribution; combining said magnitude distribution and said timing distribution by said computer into a joint-probability distribution function; plotting said joint-probability function on a topography on said computer to provide a probability texture; accepting modifications from said user in said computer to said probability texture; accepting information from said user in said computer about a relationship between possible future events; converting at least two said joint-probability functions by said computer to generate a two-dimensional net present value probability distribution; accepting modifications from said user in said computer to said joint-probability functions and re-generating a two-dimensional net present value probability distribution.