A complaint system (also known as a conflict management system, internal conflict management system, integrated conflict management system,[1] or dispute resolution system) is a set of procedures used in organizations to address complaints and resolve disputes. Complaint systems in the US have undergone significant innovation especially since about 1970 with the advent of extensive workplace regulation. Notably in many countries, conflict management channels and systems have evolved from a major focus on labor-management relations to a much wider purview that includes unionized workers and also managers, non-union employees, professional staff, students, trainees, vendors, donors, customers, etc.