Part III consists of only one paper on code mixing.  It deals about the language factor in code mixing.  Author says that three variables must be taken into account in the issue of code mixing, they are :

1.  The typology of the Language involved in mixing.

2.  The psychological relationship of the speaker with the languages involved.

3.  The differences in the situations in which the Languages are mixed.

       Therefore, in a code mixing situation, Linguistic, psycholinguistic and sociolinguistic variables play an important role in determining the constraints on mixing