It’s just over 18 months since the Cabinet Office announced the creation of a network of What Works Centres. Five are now up and running. Together, these centres have made considerable progress in pulling together available evidence on effective interventions and sharing it with frontline practitioners. Some have also helped fill gaps in our knowledge by commissioning trials. But they will need far greater support from Whitehall if they’re to fulfil their ultimate objective of informing “decision-making on £200 billion of public spending”.