No doubt many people will have read the story about how an error in a piece of software has prevented a number of women being invited to a standard screening. The current estimate is that this could have led to as many as 270 lives being lost or curtailed, although it will be difficult to say for some time. As a ex-CTO in a healthcare business, this is the type of problem that used to keep me awake at nights – a small mistake leading to tragic results. How did this happen?

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