Policy-makers are gravely troubled by a lack of means to get things done. They might like to consider harnessing the ‘Guinness effect’: when a measurement is created, persons come forth to be measured by it. A number of moral and practical objections to the use of the Guinness effect in public policy can be raised, but many of these also apply to other policy devices or indicate that care is needed in designing measurements. They do not preclude the introduction of trial uses of the Guinness effect, especially given the voluntary character of undertaking measureable activities under the scheme. A number of activities by individuals and communities suitable for measurement are suggested. Local statistical bureaus might play the part of defining measurements and monitoring performance.