Examine any two features of Bi-Party system.

(i) In some countries, power usually changes between two main parties. Several other parties may exist, contest elections and win a few seats in the national legislatures.

(ii) But only the two main parties have a serious chance of winning majority of seats to form government. Such a party system is called two-party system.

(iii) The United States of America and the United Kingdom are examples of two- partysystem.