Panchayati Raj (Council of five officials) is the system of local self-government of villages in rural India as opposed to urban and suburban municipalities. It consists of the Panchayati Raj Institutions (PRIs) through which the self-government of villages is realized. They are tasked with "economic development, strengthening social justice and implementation of Central and State Government Schemes including those 29 subjects listed in the Eleventh Schedule." Part IX of the Indian Constitution is the section of the Constitution relating to the Panchayats. It stipulates that in states or Union Territories with more than two million inhabitants there are three levels of PRIs: the Gram Panchayats at village level the Mandal Parishad or Block Samiti or Panchayat Samiti at block level and the Zila Parishad at district level. In states or Union Territories with less than two million inhabitants there are only two levels of PRIs. The Gram Sabha consists of all registered voters living in the area of a Gram Panchayat and is the organization through which village inhabitants participate directly in local government. Elections for the members of the Panchayats at all levels take place every five years. The Panchayats must include members of Scheduled Castes (SCs) and Scheduled Tribes (STs) in the same proportion as in the general population. One third of all seats and chairperson posts must be reserved for women, in some states half of all seats and chairperson posts. The modern Panchayati Raj system was introduced in India by the 73rd constitutional amendment in 1992, although it is based upon the historical Panchayati raj system of the Indian subcontinent and is also present in Pakistan, Bangladesh and Nepal. Following a proposal submitted in 1986 by the LM Singhvi Committee to make certain changes to the Panchayati raj institutions, which had already existed in early Indian history and which had been reintroduced, not very successfully, in the 20th century, the modern Panchayati raj system was formalized and introduced in India in April 1999 as the 73rd Amendment to the Constitution, following a study conducted by a number of Indian committees on various ways of implementing a more decentralized administration. The modern Panchayati Raj and its Gram Panchayats are not to be confused with the extra-constitutional Khap Panchayats found in parts of western Uttar Pradesh and Haryana. In India, the Panchayati Raj now functions as a system of governance in which gram panchayats are the basic units