Herbert Kelleher, former CEO, Southwest Airlines. "Focus is another serving of Ries' business wisdom."

Philip Kotler, J.L. Kellogg Graduate School of Management. "A very important book, well documented, well argued, but destined to be controversial. Next time your company is tempted to broaden or diversify, I guarantee that you will think twice.

Michael D. Rose, former chairman, Harrah's Entertainment. "We have become successful because of our nice narrow focus."

Harold Burson, former chairman, Burson-Marsteller. "A must-read for all marketing executives who seek to achieve marketplace leadership."

Michael Gerber, author, The E-Myth. "Big word. Big book. I recommend it heartily for anyone who needs a whack on the side of the head to remind them of the folly of being unfocused."