 Many reductionist views seem to involve ontological claims. If one denies classical substance-dualism and advocates a version of reductionism rather than eliminativism for minds, persons and mental state, then one seems to assert that objects or substances reduce to objects. If one rejects any dualistic parallelism of mental and physical events and advocates a version of reductionism rather than eliminativism for events such as perceivings, willings or pain events, then one seems to assert that events may reduce to events. If one denies property-dualism, and advocates a version of reductionism regarding properties such as that of being a person or of being a pain, then one seems to be committed to the assumption that properties reduce to properties. These different candidate-relata share one important feature: They are non-representational in nature (ignoring cases of objects that are used as vehicles for representations); they are real world items, not representations about items in the world. Especially in the philosophy of mind, these candidate relata have received special attention.