Book excerpt: A How-To Guide for the Modern Leader Inspired by Peter Drucker's groundbreaking book The Effective Executive, Laura Stack details precisely how 21st-century leaders and managers can obtain profitable, productive results by managing the intersection of two critical values: effectiveness and efficiency. Effectiveness, Stack says, is identifying and achieving the best objectives for your organization—doing the right things. Efficiency is accomplishing them with the least amount of time, effort, and cost—doing things right. If you're not clear on both, you're wasting your time. As Drucker put it, “There is nothing so useless as doing efficiently that which should not be done at all.” Stack's 3T Leadership offers twelve practices that will enable executives to be effective and efficient, grouped into three areas where leaders spend their time: Strategic Thinking, Teamwork, and Tactics. With her expert advice, you'll get scores of new ideas on how you, your team, and your organization can boost productivity.