 Other conceptual advancements have helped clarify the meaning of particular aspects of representation. For instance, Andrew Rehfeld (2009) has argued that we need to disaggregate the delegate/trustee distinction. Rehfeld highlights how representatives can be delegates and trustees in at least three different ways. For this reason, we should replace the traditional delegate/trustee distinction with three distinctions (aims, source of judgment, and responsiveness). By collapsing these three different ways of being delegates and trustees, political theorists and political scientists overlook the ways in which representatives are often partial delegates and partial trustees.