Performance reviews are excellent assets when they are done right. Carried out wrong, however, they can destroy morale, hinder productivity and breed a toxic, competitive company culture that has people constantly looking over their shoulder. The real purpose of feedback is not to offer criticism, though that can have its place too. Instead, feedback is an opportunity for management to provide guidance and support while steering workers toward the company's objectives. So before your next performance review period, keep these feedback tips in mind for long-standing results.