This D2.3 Meta Report of the YouCount Experiences with Case Study Implementation is rooted in WP2 and the implementation of hands-on youth citizen social science (Y-CSS). In particular it addresses the work of Tasks 2.1 to 2.10 which include laying the foundations and planning multi-disciplinary research teams that include professional researchers, students and young people as Youth Citizen Scientists (YCS), recruiting and engaging YCS, students and stakeholders, developing and refining research methods to explore social inclusion with YCS and conducting co-creative research with young people. The primary focus is on case experiences with implementing the social inclusion sub study. It therefore provides details of the 10 local cases in nine countries in a multiple case study of co-creative Y-CSS in Europe and their experiences. The cross case thematic analysis builds on the individual case reports, extracts from the evaluation self-reports and notes from consortium or WP2 discussions. This Report comprises six parts: (1) background and contextual overview of YouCount’s aims and intentions in implementing the multiple case study of hands-on Y-CSS; (2) planning and establishing Y-CSS; (3) recruitment, training and support of YCS; (4) methodologies adopted by the local cases including the designs, methods and data analysis conducted; (5) what co-creation meant in practice; (6) summary and conclusions. The main target groups for this Deliverable are those interested in how Y-CSS can be conducted in practice, either as practitioner, scientists or evaluator of best practices. This version 3 is the same as version 1 & 2, but included names of internal scientific reviewers and changed layout p 27.