The NATM has developed as the standard tunnelling method in Japan. In this situation K. Kovari criticized that the concept and methodology of NATM have been misled, and we are also aware of these partialy because of our own experiences last 20 years.
This note, firstly, reviews a developping process of tunnel engineering as a science methodology and it's positioning of NATM, and, secondary, proposes some subjects which should be taken into consideration to establish new tunnelling concepts.