For example, the study of Indo-European languages and Chinese (which are not related) benefits from comparison, of which the aim is to elucidate certain constant factors which underlie the establishment and development of any language. The other kind of variation, diversity of relationship, represents infinite possibilities for comparisons, through which it becomes clear that dialects and languages differ only in gradient terms. Of the two forms of diversity, Saussure considers diversity of relationship to be the more useful with regard to determining the essential cause of geographical diversity.