ESTIMATES OF the number of disabled people in the United States vary substantially, according to the particular concept and method used. The terminology used to describe disability is frequently inconsistent, and considerable confusion exists about concepts, criteria, and operational definitions. Different terms are used to designate similar aspects of disability, and the same terms are sometim...

Assessments of the environmental status of marine ecosystems are increasingly needed to inform management decisions and regulate human pressures to meet the objectives of environmental policies. This paper addresses some generic methodological challenges and related uncertainties involved in marine ecosystem assessment, using the central Baltic Sea as a case study. The objectives of good enviro...

Economic evaluation involves the comparative analysis of the costs and consequences of alternative programmes or interventions. It has increasingly been used to inform decision making about healthcare in the United Kingdom and other industrialised nations. Randomised controlled trials are commonly used as a vehicle for economic evaluations. Indeed, many funders, such as the UK National Institut...