From this weekend’s Guardian, here.
But what really set the cat among the philosophical pigeons was one implication of Kuhn’s account of the process of paradigm change. He argued that competing paradigms are “incommensurable”: that is to say, there exists no objective way of assessing their relative merits. There’s no way, for example, that one could make a checklist comparing the merits of Newtonian mechanics (which applies to snooker balls and planets but not to anything that goes on inside the atom) and quantum mechanics (which deals with what happens at the sub-atomic level). But if rival paradigms are really incommensurable, then doesn’t that imply that scientific revolutions must be based – at least in part – on irrational grounds? In which case, are not the paradigm shifts that we celebrate as great intellectual breakthroughs merely the result of outbreaks of mob psychology?