Preference change is an important topic in political philosophy, economics, psychology and decision theory. It poses a major problem for action explanation, since without the understanding of how long preferences remain stable, or of how they change after a certain period, any preference explanation is open to ad hoc modifications. It further poses a problem for normative purposes, since without an understanding of how preferences remain stable or how they change, the normative relevance of present preferences for future consequences cannot be determined. Despite this obvious importance of preference change, we find that it is treated more as a phantom than as a phenomenon: it is often mentioned to motivate theoretical arguments, but it is hardly ever the subject of systematic research itself. In this workshop, we hope to begin mending this theoretical deficit. We will convene experts from philosophy, economics and psychology to debate and compare the different approaches that have been made in modelling preference change. In particular, we want to facilitate an interdisciplinary exchange, where philosophical theories of rational decision, economic techniques of modelling behaviour and psychological empirical research inform each other – while maintaining a clear focus on the philosophical issues of these different approaches, and the way they interpret the empirical evidence.