Global citizenship education has been mainstream policy since the Education 2030 Agenda launched in 2015. The UN made it a formal target with SDG 4.7. National curricula reference it. International school networks have built programmes around it.

What has not existed, until now, is a way to answer a basic question at school level: is a school's global citizenship practice coherent, embedded, and improving?

Literacy has benchmarks. Numeracy has benchmarks. Science has benchmarks. Global citizenship education has had none. Without it, three things persist across schools everywhere.

1. The work sits in pockets. A committed teacher, a well-run project, a strong partnership. Valuable, but disconnected. Nobody inside the school can see whether these things reinforce each other or exist in parallel.

2. The work depends on people, not systems. When those people leave, or when the school faces pressure, the work does not survive. The pandemic made this visible in ways nothing else had.

3. There is no way to benchmark and grow the practice. A school can run strong projects, invest in professional learning, and build genuine partnerships, and still have no structured way to see whether these add up to something coherent, whether they are improving cycle on cycle, or where the gaps are. There is no shared standard against which to assess progress, set expectations, or plan what comes next.

We have spent the better part of a decade watching schools do this work, in around 70 countries, since 2016. The commitment is personal and the efforts are remarkable. Yet the pattern was the same everywhere. In many schools, the work is meaningful, long before it is durable.

If this matters, and it does, it cannot depend on committed individuals and good intentions alone. It needs shared ownership, clear expectations, and a simple way for a school to see what is happening, what is changing, and what needs attention next.

The Global Citizenship Schools Trustmark was built for that. Schools organise and contextualize their existing practice across six dimensions, map evidence to defined requirements, and submit for independent review. Each cycle builds on the last. The school does not start over. It goes deeper.