The Atacama Large Millimeter/submillimeter Array (ALMA) is the largest astronomical ground based global
collaboration. The project is a partnership of organisations and institutes located in four continents, each bringing its own
organisational structures, scientific objectives, and management. This brings a richness of different experiences and
expertise to the project, but is also a challenge to build and provide the public and the science users a unified project. In
this talk we will review the ALMA organisation and management structure, its successes, difficulties and experience
gained for future projects of similar complexity and challenge.