When it comes time to offer feedback, close the door, either literally or symbolically. If you don't have a door, make a gesture that signifies you're giving undivided attention to the individual. By clearing the papers off your desk, stopping whatever task you were engaged in or moving your chair closer to the individual. These actions all indicate that what you're about to do and say is important. The Quick Draw.
Great feedback is immediate.
If you notice the feedback is important to someone, don't hesitate. Prompt feedback helps establish a link in the other person's mind between her action and your response. And it signifies to the individual that you consider her important. Let's say you notice an employee struggling with some paperwork. She appears to want help.