If you are a manager or leader at any position in an organisation, here is what Mr. Drucker would want you to practice:

Do what you say and say what you do. When you are a leader, people carefully observe you. People try to derive some meaning from every small gesture of a leader. Make sure that your gestures enable people to derive a positive meaning. Keep your promises and be as authentic as you can.
When you are a leader, you are here to ‘serve’ your people. You serve your people and enable them when ‘leadership’ springs from your heart. But when it gets into your head, that is where problem starts!
Leadership is all about performance. You, as a leader, have to build an integrated team and empower them to deliver great results. Leadership is a means to an end. We don’t lead because we want to, or because of our charisma or because of (a romantic idea of) power that comes with leadership. We lead because we seek results.
An ambiguous leader leads an ambiguous team. Clarity in thoughts, words and actions is one of the most important aspect of leading others. When you lead, people depend on you to give directions to them. If your directions are ambiguous, you will easily mislead them. Clear directions are the ones which clarifies expected outcomes, expected behaviors and establishes priorities, standards. Clarity also means that all decisions/directions are aligned with organization’s mission and values.

Most of what Peter Drucker mentioned in his book, “Managing for the Future” is more of common sense (at least from today’s perspective), and I think practicing them consistently is difficult. Have a fantastic Friday and a happy weekend!