Reasons which have contributed to changes in caste system were :
(i) Efforts of political leaders and social reformers like Gandhiji, B.R. Ambedkar who advocated and worked to establish a society in which caste inequalities are absent.
(ii) Socio-economic changes such as :
1. Urbanisation
2. Growth of literacy and education
3. Occupational mobility
4. Weakening of landlord's position in the village
5. Breaking down of caste hierarchy
(iii) The Constitution of India prohibited any caste-based discrimination and laid the foundations of policies to reverse the injustices of the caste system.
(iv) Provision of fundamental right has played a major role because these rights are provided to all citizens without any discrimination.