The 8th Habit: From Effectiveness to Greatness is a book written by Stephen R. Covey, published in 2004.

The book clarifies and reinforces Covey's earlier declaration that "interdependence is a higher value than independence."

The central idea of the book is the need for steady recovery and application of the whole person paradigm, which holds that persons have four bits of intelligence - physical, intellectual, emotional, and spiritual.

[2] Most of the chapters in the book include a section discussing one of the 'stories' from the DVD, which are intended to illustrate the theme of the chapter (for example the story of Helen Keller and another about the Berlin Wall).

[3] The book talks of "5 Cancerous Behaviors" (page 135) that inhibit people's greatness: People can discover their voice because of the three gifts everyone is born with: Covey talks about great achievers expressing their voice through the use of their intelligence.