A more popular, though apparently more disputable, approach involves dividing all countries into "developing" and “developed" despite the general understanding that even the most developed countries are still undergoing development. Dividing countries into "less developed" and "more developed” does not help much either, because it is unclear where to draw the line between the two groups. In the absence of a single criterion of a country's development, such divisions can only be based on convention among researchers. For example, it is conventional in the World Bank to refer to low-income and middle-income countries as "developing," and to refer to high-income countries as "industrial" or "developed.