The European Network and Information Security Agency (ENISA) has launched new good practice guide that complements the existing set of ENISA guides for supporting Computer Emergency Response Teams (CERTs, also known as CSIRTs). The new guide describes good practices and provides practical information and guidelines for the process of preparing and issuing alerts, warnings and announcements to a CERTs constituency.
Download the full guide from here – http://www.enisa.europa.eu/activities/cert/support/awa/at_download/fullReport