In our February 2024 report on cross-government working we highlighted that a lack of routine data sharing between departments and poor arrangements for sharing best practice and learning. Learning lessons from major projects can, however, be a challenge because of the nature of some projects. It may not be immediately clear, for example, what projects can learn from such specific projects as the Millennium Dome, the London 2012 Olympics, or the programme to maintain a nuclear deterrent. That said, comparison with such projects is still possible if departments are clear about their strategic objectives and identify similarities between projects.22