The Centre for Security Science (CSS) Public Safety and Security Program (CSSP) at the request of the Federal Provincial Territorial (FPT) Senior Officials Responsible for Emergency Management (SOREM) Public Alerting Working Group, and in consultation with the public-private Common Look and Feel Working Group, produced a Technical Advisory Note (TAN) with additional information regarding CLF. Please note this technical document contains technical recommendations only, whereas the CLF document is the official guidance document.