- and that they have failed. Indeed some philosophers think
in terms of the current best effort (e.g. David Lewis justifying his views
on possible worlds.

The history of science sets us a different example. It seems that what
happens (according to Kuhn et al) that the development of science requires
the choice of a framework (what he calls a paradigm). An example might be
Newton's choice of absolute space. These frameworks are essential for
progress - if the lessons of the last few thousand years - and par