Zero-Postulation or Null-Postulation and Abstraction
The best bet is to find out the most fundamental components within the system and building a theory round these. In other words, a theory that is able to describe the world in totality has to keep the number of basic postulates it depends upon to zero or near zero.
Zero Postulation gives rise to abstraction. The abstraction we are talking about here may be defined as, “Postulation of non-postulation” or, in other words, “A system of postulation that gives equal weights to all possible solutions inside the system and favours none of such solutions over others.”