When it comes to developing people, feedback is an obligation, not an option. Yet far too many managers act as though feedback is optional. Unfortunately, few of us (if any) learn skills on our own. We need coaching, direction and opportunities to try, fail and try again. We also need positive reinforcement to keep us focused and motivated. And sometimes, we need someone to tell us where we are going wrong. Here are 15 critical strategies to guide you in offering constructive feedback.