The World Bank - Working for a world free of poverty

Analysis of issues shaping African development. April 2012
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What is the decision context?
This is a great conversation.
If I can make a request, I think it would help clarify the issues if some commenter would expand on why the more nuanced approach to poverty measurement that Martin Ravallion describes is necessarily better than targeting a very imperfect weighted composite.
What I mean is that of course each of these approaches will be prone to error, and I'm not sure about the context of the decisions. Poverty policies are very politicized - which of these approaches is more immune to political pressure (and is that a good thing)? Who is making these carefully calculated, multidimensional poverty assessments? Does it depend on the context which of these approaches we prefer?