The document summarizes the evolution of performance frameworks used by the UK government to monitor and improve public services from 1997-2014. It describes how the frameworks shifted from hundreds of targets to focus on a smaller number of cross-government priorities and outcomes. It also discusses the role of organizations like the Prime Minister's Delivery Unit and Implementation Unit in driving delivery of key government priorities by providing challenge, support and troubleshooting to departments. Overall, the document examines lessons learned about balancing accountability, outcomes and reducing bureaucracy in performance systems.