Many governments and organisations are concerned that not enough young people are choosing to study STEM subjects after the age of 16. There is also widespread concern that the profile of those who do go on to study STEM subjects and pursue STEM careers is too narrow, with women, working-class and some minority ethnic groups remaining under-represented, especially in the physical sciences and engineering. The ASPIRES study sought to shed new light on our understanding of how young people’s aspirations develop over this 10-14 age period.