Although various authors (most notably Niels Bohr) criticised the ambiguous terminology of the EPR paper, the thought experiment nevertheless generated a great deal of interest. Their notion of a "complete description" was later formalised by the suggestion of hidden variables that determine the statistics of measurement results, but to which an observer does not have access.
This led to criticism from several authors (most notably Niels Bohr) regarding the unclear language used in the EPR paper, but the thought experiment still generated significant interest. Their notion of a "complete description" was later formalized through the proposal of hidden variables that determine measurement statistics, which are not accessible to observers.