On what basis doe

The Party system is not something any country can choose easily.

(i) It evolves ever a long time, depending on the nature of its society, its social and regional divisions, its history of politics and its system of elections.

(ii) These cannot be amended very hurriedly.

(iii) Each country matures a party system that is trained by its special conditions. No system is ideal for all countries and all situations.

Thus, a party system is chosen after considering many factors.