A warning letter to an employee is a formal HR process for documenting and discussing misconduct, disciplinary issues, or poor performance with the employee. The letter may also serve as a precursor to termination by setting expectations for future behaviour. A warning letter is a formal communication channel that enables human resource managers to take control of the issue and take the appropriate actions in accordance with Company Policy. When verbal communication between an employee and their supervisor (or HR Manager) fails to produce the expected results, a written warning letter assists in highlighting the situation and documenting the gaps.