1. In this text, maximum permissible errors are stated, according to the case, as relative errors (general case) or absolute errors. 2. To simplify writing, some specifications in the present text involve the comparison of a quantity (for instance: difference between a result obtained at some specified conditions and a result obtained at reference conditions) with maximum permissible error. In this case, it is obvious that it is the absolute maximum permissible error, associated with the relative maximum permissible error, which applies.