The test which assesses whether disabled or sick people are fit to work is "patchy" and needs improvement, an expert has said.
Professor Malcolm Harrington, the man appointed by the Government to review the Work Capability Assessment, told BBC's Panorama that as a result people who are genuinely unable to work will suffer.
Professor Harrington said: "There are certainly areas where it's still not working."
According to the programme, which airs tonight, more than 176,000 people who have been judged fit to work go to appeal tribunals each year.
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