This paper sets out the recent history and evolution of the UK governments' performance measurement, monitoring and management systems from the period since 1997 and the election of the New Labor government, until today. Although, as the paper shows many of the changes the New Labor government introduced were at least partially prefigured in changes introduced in the previous two decades or more. The reason that the period since 1997 is so important is because, it represents the period in which the UK governments' system became almost universal across public activities, including measuring performance at the highest levels of government itself. The core of the performance policies developed by government over this period have been the Public Service Agreements (PSAs) promulgated since 1998, of which there have now been five rounds (1998; 2000; 2002; 2004; 2007). Whilst PSAs are not the only performance policies, or measurement, monitoring and reporting systems, they have come to be seen as the pinnacle of the whole system and, in intention at least, driving developments throughout the public services. The paper will cover only the UK government. Over the past decade significant constitutional changes have devolved some central government powers to first the Scottish Parliament and Welsh Assembly, and then more recently the Northern Ireland Assembly.