2.26 The Authority is only one organisation in the central assurance system for major projects. For the system to operate well, each of its constituent organisations, the Authority, HM Treasury, and departments, must function efficiently and effectively. But even that does not ensure sufficiently that the system will perform optimally now and into the future. There needs to be a chain of close cooperation, and factors such as how these organisations engage with each other, how lessons are learned and shared, and how data are used across the system, are also relevant.