SEREN3 is a 36-month Coordination and Support Action with the overall aim of facilitating trans-national co-operation among NCPs for Secure Societies, identifying and sharing good practices, and raising the general standard of the support to programme applicants across the EU, Associated and Third countries. To reach the objective above, the project will develop three main activity axes, corresponding to the projects’ specific objectives: 1) capacity building of NCPs; 2) strengthening the participation of relevant stakeholders to Horizon 2020 funding opportunities; 3) and supporting networking opportunities within the Secure Societies constituency. Cross-cutting activities of dissemination and communication will addup to this main set of activities, helping to enhance their impact. SEREN3 is the continuation and evolution of the precedent network, SEREN2, whose results and lessons learnt have been taken into consideration with the logic of improving the future network and in order to valorize the network’s strengths. SEREN3 will also take into account the paradigmatic change brought by Horizon 2020. This will be reflected in particular in a stronger attention of the network in terms of multidisciplinary competences, consideration of related societal challenges, and linkage with other EU relevant initiatives, funding programmes and policies. Finally, the network will seek further opening to a wider target of stakeholders and businesses in the Secure Societies field. SEREN3 consortium comprises 17 beneficiaries, with a good mix of well-experienced and less experienced NCPs, and representing Member States, Associated Countries and Third Countries. Besides beneficiaries, the project services will be offered to all officially appointed H2020 Secure Societies NCPs, who will be involved as “associated partners”.