So recently I have been thinking about when it is wise to try to discuss an issue with someone and when it is unwise. I have devised the following general breakdown of potential debators based upon personality type and topical knowledge. While it is a limited scale that only defines character in terms of a few extremes, I feel that this is a necessary evil in order to maintain a relatively simple model; a more complicated model, while potentially more accurate in specific sittuations, might lose out to the following simpler classification system in terms of usefullness:

ignorant
    unopinionated
    opinionated
informed
    intellectually honest
        unreasonable
            stubborn
            open-minded
        reasonable
            stubborn
            open-minded
    intellectually dishonest