Prof. Kate Dommett, Professor of Digital Politics at the University of Sheffield, and Dr. Simon Kruschinski, Postdoctoral Researcher in Communication at the University of Mainz, discuss their new book: Data-Driven Campaigning and Political Parties. We discuss the book's theoretical framework and findings on how system-level, regulatory-level, and party-level factors explain variation in data-driven campaigning across five democracies: the US, UK, Canada, Germany, and Australia.