Guidance on supporting improved work performance: This model letter should be used by the manager to invite the employee to a performance review meeting. 

Invite to performance review meeting 

Dear <<Employee Name>>
Performance Review Meeting
As you know from our previous discussions, I have become concerned about your performance. Specifically, it appears that you <<set out brief details of the respects in which the employee's performance falls below the required standard.>>
It is important that we resolve these problems at an early opportunity. Therefore, I am writing to arrange a meeting to discuss your performance in line with the Council’s Guidance on Supporting Improved Work Performance (attached). The purpose of the meeting is to discuss my concerns and listen to any comments or suggestions you may have and to plan actions to support your performance at work.
The meeting will take place at <<time>> on <<date>> at <<venue>>. I am also available to answer any questions you may have about the process in the meantime.
Yours sincerely

<<Manager’s Name>>