We would like to express our gratitude to the many people who institutionally and personally supported us in preparing this monograph: to all those who talked things over, read, wrote, offered comments and assisted in the editing, proofreading and design. Special thanks go to our children Tija, Zarja and Jan for giving us the inner strength to start and complete this project. Review of existing (good) practices An analysis of existing (good) policies and practices and measures in order to expose 'what works' when tackling ESL in different environments and which approaches are worthwhile learning from when developing new (school, local, national) approaches to ESL. Data for the analysis are gathered by different sources (mainly the DG EAC and EACEA websites, ESL project websites, national reports etc.). While the focus of the TITA scientific base is ESL in the EU, we also refer to practices outside Europe, which strengthens the evidence base, and suggest alternative solutions. has already been done on ESL, NESSE (2010) identified the need for a more comprehensive review of what is known about ESL. The TITA scientific base is an attempt to respond to that need. Scientific review articles, published as chapters of this monograph, are published also at the website of the TITA project (http:// titaproject.eu). Design of the website enables searching and reading the articles interactively. References Council of the European Union (2011). Council Recommendation on policies to reduce early school leaving. Brussels: Council of the European Union. Dale, Roger (2010). Early school leaving. Lessons from research for policy makers. An independent expert report submitted to the European Commission. Brussels: Network of Experts on Social Aspects of Education and Training. Edwards, Anne and Downes, Paul (2013). Alliances for Inclusion: Cross-sector policy synergies and interprofessional collaboration in and around schools. An independent report authored for the European Commission. Brussels: Network of Experts on Social Aspects of Education and Training. European Commission (2007). Commission staff working document. Towards more knowledge-based policy and practice in education and training. Brussels: European Commission. European Commission (2011). Communication from the Commission to the European Parliament, the Council, the European Economic and Social Committee and the Committee of the Regions: Tackling early school leaving: A key contribution to the Europe 2020 Agenda. Brussels: European Commission. European Parliament (2011). Study on reducing early school leaving in the EU. Brussels: European Parliament. Thematic Working Group on Early School Leaving (2013). Reducing early school leaving: Key messages and policy support. Brussels: European Commission. Over the past decade, relational competence has become part of professional development interventions (Sabol & Pianta, 2012) and initial teacher education training (Nielsen, 2017). Thus, the topic of teachers' relational competence is emerging as relevant for quality educatio...