Abstract
The definition of the term “safety” in the ISO/IEC Guide 51 has been revised for the first time in 15 years. The definition changed from “freedom from unacceptable risk” to “freedom from risk which is not tolerable”. However, its meaning seems to be same as the previous edition. It is clearly stated that the phrases “acceptable risk” and “tolerable risk” are synonymous in the footnote. In addition, several important changes were found in the new edition, such as the introduction of the perspective of consumers. This paper reports several implications of the revised edition to the risk community.
