Analysis of information sources in references of the Wikipedia article "MEST (Scientology)" in English language version.
Nor is it possible to document fully the numerous developments in the theory and practice of Dianetics during its early years. These include Hubbard's distinction between 'MEST' and 'theta' (the former is an acronym for the physical universe of Matter-Energy-Space-Time, while the latter stands for the universe of thought); the development of the 'Tone Scale', indicating the amount of 'free theta' available to the analytical mind, and according to which pre-clear individuals and groups can be classified; Hubbard's proliferation of 'logics, corollaries, axioms, and definitions' [...]; and his growing commitment to past lives and deaths.
