This advocacy toolkit prepared by the NGO Group for the CRC is designed to help NGOs and child rights advocates to understand the Optional Protocol to the CRC on a communications procedure or OP3 CRC. The toolkit provides guidelines and suggestions on how to join the global campaign to ratify the OP3 CRC The Toolkit is organised around two different fact sheets, which contain background information on the campaign, an explanation of the key provisions of the new Optional Protocol, a glossary of key terms and a list of abbreviations. The present toolkit is a revised version of previously published toolkits.