The paper aims to present the proprium dialogicum of the café philo. In theoretical terms, the philosophical dialogue in the café philo can be recognized as discursive rationality and play of the faculties ruled by the logistikon, as an exercise of critical thinking, as an endless quest of meaning, and finally as a way of life. All those theoretical acquisitions are tested by the comparison with results from one year of praxis of café philo, part of the Diderot Project supported (...) by the Fondazione CRT of Torino, conducted with more than 2.000 high-school students of Piedmont. (shrink)