Despite a great deal of debate over what a post-2015 framework should encompass, there is a general consensus that ‘eradicating extreme poverty’ should continue to be a fundamental tenet. Less agreement prevails over how this ought to be measured. Should we keep a dollar-a-day poverty line? Should it be much higher? Would national income poverty lines measure deprivation more aptly? Or is a multidimensional measure needed to truly capture the many aspects of poverty? To untangle these issues, this Development Progress blog series debates how poverty ought to be measured in the post-2015 development agenda.