This is Part 1 of the Becoming Data Driven in Business series. Goodhart’s Law is a famous adage that goes “when a measure becomes a target, it ceases to be a good measure.” If you’re not familiar with the adage, you can go read all about its history on Wikipedia, and perhaps also read the related entry on the ‘cobra effect’ (which includes a litany of entertaining perverse incentive stories, of which the eponymous cobra anecdote is merely one):The British government, concerned about the number o...