Article 368 in Part XX of the Constitution deals with the powers of Parliament to amend the Constitution and its procedure.  

• An amendment of the Constitution can be initiated only by the introduction of a bill for the purpose in either House of Parliament and not in the state legislatures.  
• The bill can be introduced either by a minister or by a private member and does not require prior permission of the president. 

• The bill must be passed in each House by a special majority, that is, a majority (that is, more than 50 per cent) of the total membership of the House and a majority of two-thirds of the members of the House present and voting. 
• Each House must pass the bill separately. In case of a disagreement between the two Houses, there is no provision for holding a joint sitting of the two Houses for the purpose of deliberation and passage of the bill. 
• If the bill seeks to amend the federal provisions of the Constitution, it must also be ratified by the legislatures of half of the states by a simple majority, that is, a majority of the members of the House present and voting. 
• After duly passed by both the Houses of Parliament and ratified by the state legislatures, where necessary, the bill is presented to the president for assent. 
• The president must give his assent to the bill. He can neither withhold his assent to the bill nor return the bill for reconsideration of the Parliament. 

• After the president’s assent, the bill becomes an Act (i.e., a constitutional amendment act) and the Constitution stands amended in accordance with the terms of the Act. 

Source: Indian Polity by Laxmikanth