Grievance procedures provide a systematic process for employees to file complaints and have them addressed in order to protect employee rights and avoid strikes. They involve multiple steps starting with filing the grievance with a direct supervisor and potentially leading to arbitration. Common causes of grievances include differing interpretations of policies, perceived unfair treatment, violations of agreements or laws, and lack of clear company policies. Both employees and unions can file grievances. Supervisors are encouraged to take all complaints seriously, thoroughly investigate the facts, and follow up to ensure issues are resolved.