This book reflects, through a judicious choice of certain fields of expertise, the reality of the practice of human resources management. It is a research that first teaches us the definition and the importance of a given field and then deals with a theme of a modern and current scope. This choice was made to allow learners to better understand human resources management in its entirety. However, all the material used in this masterpiece has been drawn from the courses and sessions that we have been able to accumulate during our studies. In the end, it is a book that has been written with the utmost passion for management science and represents an opportunity to better understand the diversity of human resources practice around the world.