Summary of Gary Keller & Jay Papasan's The ONE Thing is a business-centered, self-help book about finding a more narrow focus in life. Keller's business life was busy and cluttered until he came to the realization that, by stepping down from his position as chief executive officer and focusing on building the company through a concentrated task, he could facilitate stronger growth than what he created by being involved in many different tasks. Just as small dominoes can topple larger dominoes, big achievements can be gained through a series of apparently minor actions that build momentum over time.

A narrow focus on one product is evident in many of the most successful companies, including Apple and Intel. Some of the most successful people embarked on their path to success as the result of one personal connection. They also often have shared a single-minded focus on one subject or passion, like a sport or country...