REDMAS (Red de Masculinidad por la Igualdad de Género) is a network based in Nicaragua which is composed of 19 Nicaraguan organisations working on gender and masculinities and which aims to build knowledge on related theories and methodologies by creating spaces where its members can share experiences and reflections. The objective of this manual is to document lessons learnt by the network on experiences, methodologies and planning that can contribute to strengthening future work both with all-male and mixed groups, particularly focusing on children, adolescents and youth.