Procedures regarding Client continuance as per SA-220

mayank verma (65 Points)

26 March 2019  
As per SA-300, preliminary engagement activity shall be undertaken by the auditor or engagement partner ,in the case of recurring audit,which includes a point:
he shall perform procedures regarding the continuance of the client relationship as required by SA-220.
so what are the procedures actually?
please specify what type of procedures he can do?
please reply,thankyou