We therefore asked the Department whether it was concerned that so many decisions were being overturned. The Department stressed that there was a degree of judgement involved in the health assessment process it used to determine eligibility for disability benefits, compared to, say, a mathematical formula, which could be used for benefits such as income replacement benefit or state pension. It explained that “a huge amount of time” went into understanding the way in which a particular health condition is disability was affecting someone’s daily living or mobility, “but you can sometimes look at the same situation and take a different judgement”. It explained that this was rarely because new evidence was provided, but sometimes because the medical condition had fluctuated over time. It told us that in some instances, when it came to a tribunal, “the case is put more clearly or the questions are answered in a different way, and you suddenly see the picture more clearly than earlier in the process when it was missed”.50