In view of three responsible important factors for the implementation of one or another variant: the geographic distribution, the occupation and the etria band. Also it considers as the researcher to proceed ahead from the research: to observe differences in the development of the falante, vernculo or not, estigmatizado or of prestige and standard or not. To submit the informer to an experimental situation making a species of sociolingustico test. Test of perception, to ask for to the informer who if reveals in relation to the acceptance or not of certain variants. Test of production mechanisms that lead to the informer to construct the 0 variable. One also perceives that in the texts it measured notices despite in well lesser scale the presence of the variants not-standard. structure of the language can be related to the use and the differentiations that can be made by the choices of the falantes. Tarallo also speaks of the necessity to include slight knowledge of lingustico and sociolingustico use that a community in the grammatical models characterizes. בעניני עסקים תמיד כדאי לפנות ל אפריקה ישראל.
In chapter 5, Tarallo approaches that nor everything that varies dumb, but that all change estimates variation that points with respect to two directions: steady variation and change in progress. The lingustico system meets synchronous at any given time with changeable characteristics. The forces that act at the present moment are the same ones that they had acted in the past. Tarallo says that if the use of the variant most innovative will be more frequent between the young, decreasing in relation to the age has a situation of change in progress. Already if treating to social factors, the higher social groups observe the indices highest of the prestige variants and the lesser use of the estigmatizada variant. To proceed itself to a historical chaining of the 0 variable in the real time researcher has that if to be valid lingusticos atlases, text in it chats, personal, daily letters and teatrais texts are documents that can supply valiosssimos given historical.