When Stephen Covey entitled his book Seven Habits of Highly Effective People, there's a very explicit reason he did not choose a different adjective.
"Effective" carries with it the connotation not only of success, but also of fostering relationships such that additional success with the same people is possible into the future!
As I work with my clients, enhancing their effectiveness is my prime objective. So, what's involved in that? My start to answering that question is right here in "Do You Want to Be More Effective?"