Visionary in its first publication in 1936, the book of Dale Carnegie in spring 2014 (French edition), as relevant, reviewed, updated, and expanded to stick to the new communication reality of our times. With the same simplicity as the original, concrete, practical and operational, the new text demonstrates how the 30 principles set out above human relations are still valid. We find there, how we can develop a respectful interpersonal communication on the other, honest and positive that will allow us to be better known, accepted and valued by creating genuine human relations, while exerting a lasting and positive impact on our surroundings. A great read for anyone who wants to strengthen its leadership!