The assumption behind Big Data is that, if you have perfect data, you can draw inferences from it without needing experience, judgement and professional knowhow. In the past, the quality of medical care was judged by inspection by highly experienced professionals. Review by peers. The quality of a highly advanced surgical technique was, we believed, best judged by a highly competent surgeon, for example. The person best placed to tell why a bridge fell down was an experienced bridge engineer. We now have the idea that, given the 'data', this can instead be left to a general-purpose 'manager' who knew some general skill called management. Even in my parents time, this was considered a laughable idea. It just frightens me more than somewhat. It isn't just Medicine. In the UK, education has been wrecked by an obsessional pursuit of tests and criteria by central government.