In the process of implementing a new computer language, the point AT which the language is sufficiently effective thAT one can implement the language in itself. ThAT is, for a new language called, hypothetically, FOOGOL, one has reached break-even when one can write a demonstrATion compiler for FOOGOL in FOOGOL, discard the original implementATion language, and thereafter use working versions of FOOGOL to develop newer ones. This is an important milestone. See {My Favourite Toy Language}. [There actually is a language called Foogol].