What is Multi-Domain Integration? Background The Defence Integrated Operating Concept 2025 set out the case for change in defence, and explained the changes to the threats and the challenges faced by the UK. Multi-Domain Integration is about ensuring that every part of defence can work seamlessly together, and with government departments and Britain’s allies, to ensure it is capable of responding to the threats we face. MDI Vision To create a unified way of working between all parts of defence, which uses every capability in concert to support a desired outcome. To use modern technology to enable this to happen more quickly, more efficiently, and more often.