Specific examples drawing on experiences in Australia, England, Netherlands, Sweden and the United States are explored further in the following sections. Other promising examples, for which there is not space to describe in full here, are developing in a number of other OECD countries and progress should be followed attentively, for example the MARS project in Switzerland and the Scottish Recovery Indicator 2 approach. Countries have adopted different approaches to the development of indicators, standards and targets. Differences exist between countries in the extent to which such measures are mandatory or not, which in turn may be related to their purpose.