As we understand them, dispositions are relatively uncontroversial ''predicatory'' properties had by objects disposed in certain ways. By contrast, powers are hypothetical ''ontic'' properties posited in order to explain dispositional behaviour. Chapter 1 outlines this distinction in more detail. Chapter 2 offers a summary of the issues surrounding analysis of dispositions and various strategies in contemporary literature to address them, including one of our own. Chapter 3 describes some of the important questions facing the metaphysics of powers including why they''re worth positing, and how they might metaphysically explain laws of nature and modality.