Stephen Covey today counts as one of the absolute top-management gurus. If you read this book, you'll understand why.
The book is divided into four parts.
The first part deals with the fundamentals that everything else builds upon: paradigms and principles. An important theme running through all of Covey's work is that of ethical behaviour and delivering one's contribution to society as a necessary ingredient of succesful living.
In part two the author shows you a number of principles that help you to deal with yourself, such as taking responsibility for your own actions and prioritizing your goals.
Part three talks about working with other people, addressing such issues as win/win thinking and active listening.
The fourth and last part talks about sustaining the things that you have learned and continuing to grow.
This book is not a push-over. It has a high level of abstraction. Also, part of this book sounds more like philosophy or even religion, which will not sit well with everyone. However, the author is perfectly correct in first discussing basic values and priorities ("doing the right things") before discussing techniques for raising efficiency ("doing things right").
Also, it is important that you realise that this is not a self-help book for people who have real specific issues on their hands (self-discipline, traumas, lacking social skill etc.) They will probably need to deal with those specific issues first, before they will be able to take the maximum out of this book.
For those who feel that their life is reasonably sorted out, but would like to go (much) further, this is a must-read book.