The report 'Young people's political participation from the inside: activists' perspectives on forms, causes, motives and the future' was developed as part of the Study on Youth Political Participation in Portugal (2019-2021), funded by the Calouste Gulbenkian Foundation. A study that analyzed the political participation of young people in Portugal in a comparative way over the last few decades, portraying their attitudes and behaviour in politics, namely their relationship with political parties and associative structures, as well as emerging forms of youth activism.