Interest conflicts involve things that cannot be split and goals that are mutually exclusive. If I want to drive the convertible to the beach this weekend, you cannot have it to drive around town while I am away. The exclusivity may be real (as above), or perceived. In perceived exclusivity, alternative to the zero sum goal may be found through invention of options. However, the parties may be unwilling to apply creative solutions if the things or goals to be split hold deep meaning to both.