Davide Vittori is postdoctoral researcher at the Unviersité Libre de Bruxelles. He works on political parties, voting behaviour, populism, citizens’ attitudes towards democracy, democratic innovations, and technocracy. He has published on these topics on several international political science journals.

• 1 Challenging the tradition(s)?: An introduction 2 How do Challenger parties compete, organize, and articulate their ideologies? 3 A political success in turbulent times 4 Defining “political success”: The rise of Podemos, SYRIZA, and M5S5 Podemos 6 SYRIZA 7 Five Star Movement 8 Conclusion

Davide Vittori is postdoctoral researcher at the Unviersité Libre de Bruxelles. He works on political parties, voting behaviour, populism, citizens’ attitudes towards democracy, democratic innovations, and technocracy. He has published on these topics on several international political science journals.

• 1 Challenging the tradition(s)?: An introduction 2 How do Challenger parties compete, organize, and articulate their ideologies? 3 A political success in turbulent times 4 Defining “political success”: The rise of Podemos, SYRIZA, and M5S5 Podemos 6 SYRIZA 7 Five Star Movement 8 Conclusion

Davide Vittori is postdoctoral researcher at the Unviersité Libre de Bruxelles. He works on political parties, voting behaviour, populism, citizens’ attitudes towards democracy, democratic innovations, and technocracy. He has published on these topics on several international political science journals.

• 1 Challenging the tradition(s)?: An introduction 2 How do Challenger parties compete, organize, and articulate their ideologies? 3 A political success in turbulent times 4 Defining “political success”: The rise of Podemos, SYRIZA, and M5S5 Podemos 6 SYRIZA 7 Five Star Movement 8 Conclusion