How are the majors grouped within each division, and how are the careers grouped? It looks like the careers and the majors are both grouped from least to most

How are the majors grouped within each division, and how are the careers grouped? It looks like the careers and the majors are both grouped from least to most quantitative (see, for example, the fact that economics and psychology are towards the bottom of group 2). Is this done in some systematic way or just by eyeballing?