James Plunkett writes Iterate, if you can:
Because linear mentalities have crept back in some places, it would be worth a big new push to restate the basic case for iterative and user-centred methods, and to insist on the associated operating model (e.g. mixed discipline teams). Clarity is key: assert the basic principles of iterative working, explain why it reduces risk and makes better use of public money, be insistent on the model, etc. Test & Learn might be the best framing/vehicle for this, but it will need strong support from the highest levels of government if contemporary management practices and operating models are to become non-negotiable.