Jan Pieter Beetz is Assistant Professor in Political Theory and European Integration at Utrecht University, the Netherlands. His research focuses on the integration of empirical and normative reflection in political theory and the challenges to a democratic EU in the 21st century.Selin Dilli is Associate Professor of Economic and Social History at Utrecht University, the Netherlands. Her research examines how changes in institutional and structural conditions have influenced gender (in)equality in outcomes such as health, politics, household roles, work, and female entrepreneurship throughout the long 20th century.

• ContentAcknowledgement/forwardEditor and author biographies1 An interdisciplinary PPE+ research approach for understanding 21st-century challengesSelin Dilli & Jan Pieter Beetz2 An interdisciplinary approach for PPE+ research projectsJan Pieter Beetz and Selin Dilli3 From migration to membership: The uneven rise of dual citizenshipJamie Draper & Swantje Falcke4 Divided democracies: Is polarization a problem?Jonathan Benson & Stefanie Beyens5 Digital Society and Structural Inequality: How does automating decisions impact inequalities? Merve Burnazoglu & Felix-Christopher von Nostitz6 From invisible to visible: How to explain gender inequalities in the labor force with an interdisciplinary frameworkSelin Dilli & Chantal Remery7 Climate change mitigation: How social values and future generations should be included to climate decisions Lorina Buhr & Julia Swart8 How to understand competing freedom claimsDorothea Gädeke & René Koekkoek9 What kind of international political integration is desirable for democracies? An interdisciplinary analysis with application to the EUJan Pieter Beetz & Martijn Huysmans10 Lessons for future PPE+ interdisciplinary research drawn from practiceJan Pieter Beetz & Selin Dilli Index

Jan Pieter Beetz is Assistant Professor in Political Theory and European Integration at Utrecht University, the Netherlands. His research focuses on the integration of empirical and normative reflection in political theory and the challenges to a democratic EU in the 21st century.Selin Dilli is Associate Professor of Economic and Social History at Utrecht University, the Netherlands. Her research examines how changes in institutional and structural conditions have influenced gender (in)equality in outcomes such as health, politics, household roles, work, and female entrepreneurship throughout the long 20th century.

• ContentAcknowledgement/forwardEditor and author biographies1 An interdisciplinary PPE+ research approach for understanding 21st-century challengesSelin Dilli & Jan Pieter Beetz2 An interdisciplinary approach for PPE+ research projectsJan Pieter Beetz and Selin Dilli3 From migration to membership: The uneven rise of dual citizenshipJamie Draper & Swantje Falcke4 Divided democracies: Is polarization a problem?Jonathan Benson & Stefanie Beyens5 Digital Society and Structural Inequality: How does automating decisions impact inequalities? Merve Burnazoglu & Felix-Christopher von Nostitz6 From invisible to visible: How to explain gender inequalities in the labor force with an interdisciplinary frameworkSelin Dilli & Chantal Remery7 Climate change mitigation: How social values and future generations should be included to climate decisions Lorina Buhr & Julia Swart8 How to understand competing freedom claimsDorothea Gädeke & René Koekkoek9 What kind of international political integration is desirable for democracies? An interdisciplinary analysis with application to the EUJan Pieter Beetz & Martijn Huysmans10 Lessons for future PPE+ interdisciplinary research drawn from practiceJan Pieter Beetz & Selin Dilli Index

Jan Pieter Beetz is Assistant Professor in Political Theory and European Integration at Utrecht University, the Netherlands. His research focuses on the integration of empirical and normative reflection in political theory and the challenges to a democratic EU in the 21st century.Selin Dilli is Associate Professor of Economic and Social History at Utrecht University, the Netherlands. Her research examines how changes in institutional and structural conditions have influenced gender (in)equality in outcomes such as health, politics, household roles, work, and female entrepreneurship throughout the long 20th century.

• ContentAcknowledgement/forwardEditor and author biographies1 An interdisciplinary PPE+ research approach for understanding 21st-century challengesSelin Dilli & Jan Pieter Beetz2 An interdisciplinary approach for PPE+ research projectsJan Pieter Beetz and Selin Dilli3 From migration to membership: The uneven rise of dual citizenshipJamie Draper & Swantje Falcke4 Divided democracies: Is polarization a problem?Jonathan Benson & Stefanie Beyens5 Digital Society and Structural Inequality: How does automating decisions impact inequalities? Merve Burnazoglu & Felix-Christopher von Nostitz6 From invisible to visible: How to explain gender inequalities in the labor force with an interdisciplinary frameworkSelin Dilli & Chantal Remery7 Climate change mitigation: How social values and future generations should be included to climate decisions Lorina Buhr & Julia Swart8 How to understand competing freedom claimsDorothea Gädeke & René Koekkoek9 What kind of international political integration is desirable for democracies? An interdisciplinary analysis with application to the EUJan Pieter Beetz & Martijn Huysmans10 Lessons for future PPE+ interdisciplinary research drawn from practiceJan Pieter Beetz & Selin Dilli Index