This book collects a series of papers originally published in JCOM, the Journal of Science Communication or presented at the PCST 2014 conference They are all related to the project “SiS Catalyst — Children as change agents for science in society”, funded within the framework of the FP7 Mobilisation and Mutual Learning actions. Some of these papers are more focused on case studies, others are more theoretical, but all of them relate to the main objective of the SiS Catalyst project: to cross science in society and social inclusion agendas, focusing on science communication activities that involve children. The collection of papers has been organised into three parts. The first is devoted to the importance of listening to young people in science communication activities. The second part delves deeper into the issue of social inclusion in science in society activities involving direct contact with audiences. The final part indicates some training and activity options that promote the value of child participation and social inclusion in science communication