An investigation is conducted into the hypothesized notion of the interlanguage system and its effect on language transfer. The interlanguage system is composed of: internal factors (syntax, semantics, and phonology); external factors (sociological and psychological); and the typology of the native language. The investigation looks into: (1) language transfer based on interlanguage along with the internalizing processes; (2) typological classification of languages looking at an example from the Japanese language; and (3) the sociological environment. (GLR)