Due diligence is the process of using a review, audit, or investigation to confirm details or facts of a matter. In the HR world, when a staff member makes a complaint about someone else, an HR representative must perform due diligence when investigating the events supporting this claim.
Before an employee can be fired or put on a disciplinary layoff, you must first do due diligence as an employer to confirm that the staff member broke a rule or behaved inappropriately. Otherwise, this leaves you open to the risk of an unjustified dismissal claim. Due diligence ensures that HR processes are completely sound.