In 1990, a Working Group of the International Commission on Snow and Ice (ICSI) led by Sam Colbeck presented a full revision of the 1954 snow classification. It was based on a more physical view of snow metamorphism as pioneered by Sommerfeld and LaChapelle in 1970 (Journal of Glaciology, 9(55), pp. 3-18). Nevertheless, the Working Group stuck to the spirit of the former classifications.
International Association of Cryospheric Sciences