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  If you’re anything like me, you’ll have been paying lip service to the concept of ROI for years. I’m generally sceptical of the validity of most ROI calculations, but don’t have a credible argument for why we shouldn’t attempt them. I generally mumble something about ‘qualitative’ data and look a bit sheepish. So in…

Some things are a numbers game: retail sales, top-flight athletics, fund management. There are standard yardsticks, you can compare the players, and there’s intense competition. Some things clearly aren’t like that: teaching, poetry, social care, research science, political lobbying maybe. That’s not to say that people don’t try, or that there aren’t measurable factors or…