Welfare that works?

How do you alleviate poverty without creating incentives to become poor? Brazil may have the answer. From the Economist:

Bolsa Família works as follows. Where a family earns less than 120 reais ($68) per head per month, mothers are paid a benefit of up to 95 reais on condition that their children go to school and take part in government vaccination programmes. Municipal governments do much of the collection of data on eligibility and compliance, but payments are made by the federal government. Each beneficiary receives a debit card which is charged up every month, unless the recipient has not met the necessary conditions, in which case (and after a couple of warnings) the payment is suspended. Some 11m families now receive the benefit, equivalent to a quarter of Brazil's population.