Those in Category 1 are doing the best in coping with Y2K, yet an estimated 15 % of their enterprises will suffer serious operational impact from Y2K. The proportion of affected firms doubles for Category 2 countries, to one in three. Taiwan, Korea, Singapore, and Hong Kong are in this category.
A 級國家儘管進度領先，但估計仍有百分之十五的企業會在千禧蟲攻擊下遭受衝擊；這個比例在 B 級驟升一倍，達到三分之一，包括台、韓、星等小龍都屬於這一級。