They are both harsh figures, but such is the measurement of progress in drug development.

BBC: Letter from America: Buy and cell

While the debates on the measurement of economic performance and social progress more often than not adopt a technical stance, this technicality must not mask the challenges linked to measurement.

UNESCO: Main Menu

Headteachers' leader, David Hart, said that adopting a measurement system based on the individual progress of children - and not measuring them against national benchmarks - could be the key to an agreement.

BBC: Pay dispute over pupil improvement

Stiglitz was chair of the Commission on the Measurement of Economic Performance and Social Progress in 2008 and last year was appointed to the United Nations General Assembly as chair of the Commission of Experts on Reform of the International Financial and Monetary System.

FORBES: Intelligent Investing Briefing Book

Measurement and evaluation of social programs and their impact on business is a work in progress.

FORBES: Moving Beyond CSR: The Business of Social Change