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Campaigners are concerned that simply changing measurements does not do anything to tackle the basic underlying causes of poverty - and may add unhelpful distractions.
They say it could dilute targeting the true causes of poverty - where income remains the key variant.
Iain Duncan Smith will today seek to reassure critics that he is committed to ending child poverty but insist that "meaningful and accurate" measures must replace "arbitrary" household income targets.
The Work and Pensions Secretary will launch a consultation on controversial plans to move away from the poverty indicator introduced by Labour, which defines it as those children living in households with less than 60% of the median income.
Latest ITV News reports
It's no secret that the Government is struggling to end child poverty. But Labour also found it difficult.