A probationary period can help both the new employee and the employer to focus on what needs to be done to ensure that the employee performs well in the role.
In some circumstances, for example if the employee's performance is not at a satisfactory level, the employer should consider whether or not to extend the period of probation.
The employer should ensure that extending the probationary period does not result in a breach of contract and should be aware of the risk of discrimination or of subjecting the employee to a detriment, particularly where the employee has been absent due to pregnancy, family-related leave or sickness.