About different interpretations of the formulation of the concept "safe zone"

The idea of "a safe zone" and the standard formulation of this concept is considered. The attention to vaguenesses of the standard formulation is focused that in some cases results in discrepancy between idea and interpretations of this concept meeting in literature. In other words, because of the indistinct standard formulation of the concept "safe zone" there is possible a distortion of the idea put in this concept.