What Donella does very well is putting focus on the right thing, she explains that we “can learn how to look for leverage points for change”, and not any change but transformative change. Her list with 12 levels of change is a great inspiration and should be used more often than it is. It is also available on wiki here.
So much of today discussion is about “Constants, parameters, numbers (such as subsidies, taxes, standards)” and very little is about the “Goal of the system” and even less about the “Mindset or paradigm that the system — its goals, structure, rules, delays, parameters — arises out of”.
What is most rewarding with the book is the honesty and wisdom in the last chapters. The self-reflection and understanding that everything can not be calculated and planned, that what we need to “dance with the system” and that there is a need for those who dare to speak out even if they don’t always have numbers to put on their feelings. Few books have this kind of balance between being humble and still a strong call for action when it comes to the great challenges of our time.