A coalition government is formed when more than one political party or group comes together on the basis of common understanding or agenda. In India after 1989 multi-party coalitional model has emerged at the national level. Since then coalitional governments formed in India under the leadership of different parties. Some proved successful and some failed because of the growing importance of regional or state parties in formation of coalition governments Federal practices of the Indian constitution have become more effective, the coalition is dominated by the regional parties, and centralized tendencies are becoming weak. Centralized nature of Indian federal polity moved towards cooperative federalism.