 In terms of resolvability, there are three major types of preference incompleteness. First, incompleteness may be uniquely resolvable, i.e. resolvable in exactly one way. The most natural reason for this type of incompleteness is lack of knowledge or reflection. Behind what we perceive as an incomplete preference relation there may be a complete preference relation that we can arrive at through observation, introspection, logical inference, or some other means of discovery. 