Which approach would you recommend for the managers to use to manage the grievance effectively?

Which approach would you recommend for the managers to use to manage the grievance effectively?

The Managers should take a quick action regarding the grievance redressal. He should identify and resolve it immediately. Training must be given to the managers to manage a grievance effectively and aptly. The manager must acknowledge the grievance put forward by the employee as a presentation of true and real feelings of the employees. The actual cause of grievance should be identified & remedial actions should be taken to prevent repetition of the grievance. The manager should execute the decision quickly, ignoring whether it may hurt the concerned employees. After implementing the decision, a follow-up must be there to ensure that the grievance has been resolved completely.