With a far greater share of the student cohort progressing into upper secondary education than previous generations, modern upper secondary systems need to accommodate a wider variety of student interests, aspirations and learning levels. To respond to these needs, countries need to balance choice and specialisation to promote coherence. Systems that provide too much choice or specialisation risk hindering coherence, while those with too little choice or specialisation risk that upper secondary does not enable students to identify their interests and deepen their skills in those areas, which is essential for smooth transitions into post-secondary pathways and the labour market. This Education Spotlight provides a framework for countries to consider how far their current system supports the goals of choice, specialisation and coherence and provides examples from across OECD countries as inspiration for future reforms.