The Guardian

Many people were also enraged by Kuhn’s description of most scientific activity as mere “puzzle-solving” – as if mankind’s most earnest quest for knowledge was akin to doing the Times crossword. But in fact these critics were over-sensitive. A puzzle is something to which there is a solution. That doesn’t mean that finding it is easy or that it will not require great ingenuity and sustained effort. The unconscionably expensive quest for the Higgs boson that has recently come to fruition at Cern, for example, is a prime example of puzzle-solving because the existence of the particle was predicted by the prevailing paradigm, the so-called “standard model” of particle physics.

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?

Kuhn’s book spawned a whole industry of commentary, interpretation and exegesis. His emphasis on the importance of communities of scientists clustered round a shared paradigm essentially triggered the growth of a new academic discipline – the sociology of science – in which researchers began to examine scientific disciplines much as anthropologists studied exotic tribes, and in which science was regarded not as a sacred, untouchable product of the Enlightenment but as just another subculture.