We build up a simplified model of reality by making assumptions about how the world works, and then we try to assume everything away apart from that specific issue we are focusing on. (faith.org.uk)
The book starts off by acknowledging that our current model of reality isn't standing strong against recent scientific discoveries. (biocentrismnews.com)
A view like mine would make it very difficult for economists to create simple mathematical models of reality. (alephblog.com)