Practical and efficient synthesis of evil of the century. The authors' approach is very complementary. Everyone can find happiness: physiological approach, psychological, social, ... This book speaks to all times to each of us. It offers a simple and essential theoretical approach and exercises that everyone can adapt according to his desire and choices. And in the end, it's really convincing. For my part, I read a first time in its entirety and then I came back in more detail on each chapter making the link with my operation. The clarity of the summary provides an effective non linear approach. The bibliography of each chapter allows if desired to go further. I could even use some ideas with my 5 year old daughter to help him take a step back from certain stressful situations for her. In short, efficiency 100% and 0 constraint.