Science Fiction fans will be familiar with the two dimensional "Pournelle Axes", which were the subject of his Political Science doctoral dissertation in 1963. The axes are "rationalism" (from 'everything can be explained logically' to 'everything depends on the leader') and "statism" (from 'the state is intrinsically evil' to 'the state is intrinsically good').

I've always wanted to see some kind of analysis along these lines: how many axes are required to form a reasonable number of reasonably homogeneous groups and how well does such an analysis predict responses on out-of-sample questions?