89th Constitutional Amendment Act, 2003:

89^th Constitutional Amendment Act, 2003: Provided for the establishment of a separate National Commission for Scheduled Tribes by bifurcating the existing National Commission for Scheduled Castes and Scheduled Tribes. The commission shall consist of a Chairman, Vice- Chairman and three other members. They shall be appointed by the President of India.

90^th Constitutional Amendment Act, 2003:  This amendment was necessitated due to creation of Bodoland Territorial Areas District within the State of Assam by agreement reached between the Centre and Bodo representatives for solving Bodoland problem. It stated that the representation of Scheduled Tribes and non-Scheduled Tribes in the Constitution of the Bodoland Territorial Areas District shall be maintained. It meant that the representation of the above categories shall be remaining the same as existed prior to the creation of Bodoland Territorial Areas District.

91^st Constitutional Amendment Act, 2003 (w.e.f. 01.01.2004) : This amendment limits the size of ministries at the Centre and in States. According to new Clauses (1-A) the total number of Ministers, including the prime Minister in the Union council of ministers or Chief Minister in the State Legislative Assemblies shall not exceed 15 per cent of the total members of the Lok Sabha in the Centre or Vidhan Sabha in the states. The new Clause (1-B) of Article 75 provides that a member of either House of parliament belonging to any political party who is disqualified for being member of that house on the ground of defection shall also be disqualified to be appointed as a minister under Clauses (1) of Art. 75 and 164 until he is again elected. However, the number of Ministers, including the Chief Minister in a State shall not be less than 12 (in smaller states like Sikkim, Mizoram and Goa).

92^nd Constitutional Amendment Act, 2003 (w.e.f. 07.01.2004):

it amended the Eighth Schedule of the Constitution and has inserted 4 new languages in it, namely – Bodo, Dogri, Maithili and Santhali. After this amendment the total number of constitutionally recognized official languages has become 22.   

93^rd Constitutional Amendment Act, 2005 (w.e.f. 20.01.2006): Provided reservation in admissions in private unaided educational institutions for students belonging to scheduled castes/ tribes and other backward classes.

94^th Constitutional Amendment Act, 2006: Excluded Bihar from the provision to Clause (1) of Art. 164 of the constitution which provides that there shall be a minister in charge of tribal welfare who may in addition be in charge of the welfare of the Scheduled Castes and backward classes in Bihar, Madhya  Pradesh and Orissa (now Odisha). It extends the provisions of clause (1) of Art. 164 to the newly formed states of Chhattisgarh and Jharkhand.

95^th Constitutional Amendment Act, 2009: Extended the reservation of seats for SCs and STs in the Lok Sabha and state assemblies by another 10 years (beyond January 25, 2010). The time period of 60 years under Art. 334 of the constitution was to lapse on January 25, 2010. Through this amendment in Art. 334 the words ‘sixty years’ have been substituted by ‘seventy years’.