The main difficulty with this criticism lies in how to operationalize the multidimensional notion of poverty. Responding to this issue, some offer to reduce multidimensionality to a few "basic" dimensions. The United Nations Development Programme (UNDP) human poverty index is an attempt to go beyond income in constructing a composite poverty index. The Millennium Development Goals also recognize the multidimensional nature of human well-being through the deployment of a broad range of objectives and targets. The contention here is that the nature of poverty is country-specific. Along these lines, it has been argued that by using a common international poverty threshold that would be applicable to the poorest countries, one would necessarily underestimate global poverty.