Criticism of the Work Capability Assessment group of experts — a professor of psychiatry, a consultant psychiatrist in learning disability, a professor of rheumatology, and an expert in human resources — reviewed the WCA in 2013 and concluded that "the WCA produced consistent results on the whole, and is an accurate indicator of work capability compared with expert opinion". But in the year that the study was published, the firms running back-to-work training for people on ESA said they had "ongoing concerns about the accuracy of the WCA". And in 2014, Atos announced that it had come to the conclusion that "the WCA is not working
Criticism of the Work Capability Assessment Professor Paul Gregg, an economist and one of the original architects of ESA, warned that the WCA was "badly malfunctioning" and urged further pilot studies before the new version was used to retest existing sickness benefit recipients. Three months later, six experts in mental health — including the chief executive of MIND, who was already a senior advisor to the DWP on the WCA — wrote to "The Guardian" to say that the test was "deeply flawed". In 2013, the DWP published an 'evidence-based review' of the WCA. The department said "a steering group of experts chaired by Professor Harrington