The key to Big Data in enterprises; complete, clear and pedagogical. Any actor will find material to understand, identify and take action, including HR topics and organization. Big Data is taken not as a fad but as a real trend and recorded over time. Many examples Business, a definition illustrated by a matrix, a state computer to monitor developments and to grasp mathematical principles provide, among others, the tools to move forward on the subject, outside media excitement and commercial hype. Indispensable, with the right amount of humor .....