The reasonableness is a basic ideal of a philosophical education. Such ideal is especially expressed in “Philosophy for Children ” by the notion, still open to multiple interpretations, of “good reasons”. “Being reasonable ” means, in its widest sense, the trend, the finely cultivated habit, of giving, asking and evaluating reasons for our thoughts, feelings, actions, words, actions, or wishes. What is demanded of those who participate in a community of inquiry is the permanent effort of searching for the best reasons for what we are, feel, think, say or wish to do. Why are good reasons necessary? How are those reasons to be evaluated? What allows us to distinguish between a good and a bad reason? What are the main characteristics of a good...