This book is a compilation of tests in relation to the practice of leadership. These tests have been designed by the authors in the course of their teaching and consulting activities, and validated through hundreds of seminars all over the world with a large number of participants offering all kinds of different profiles and operating in various functions within a great variety of for profit and non-profit organizations. Readers can use the self-assessment exercises for their own sake (Self Development), for the benefit of their teams (Team Building) as well as for their organizations (Cultural Diagnosis). We also encourage Professors and Teachers to include them in their curricula to make the learning more exciting and powerful