This research explores how and why Nudges and Behavioural Insights are increasingly used in public policy, and seeks to contribute to both scholarship and practice. Government administrations around the world are increasingly adopting a new policy tool, known commonly as Nudging. Nudges are also an emerging tool in Australia, with units to test and develop these policies established at the state and federal level. Nudges involve the application of the principles of behavioural economics and psychology in understanding human behaviour to public policy. Advocates of Nudging argue that policy makers are choice architects, who should design policy to help citizens make the right choice. However, what exactly constitutes a Nudge is debated and there are implications on the use of Nudging on public policy and the relationship between citizens and the state. There is little evidence to understand why policy makers are choosing to Nudge, and the voices of those policy makers, the choice architects, are largely excluded from the literature. Interpretive policy approaches will be used to explore how policy makers understand and use Nudges, and uncover the reasons policy makers in Australia are Nudging.