The Constitution of India is the supreme law of India. It is a living document, the permanent instrument which makes the government system work. It lays down the framework defining fundamental political principles, establishes the structure, procedures, powers and duties of government institutions and sets out fundamental rights, directive principles and the duties of citizens. It is the longest written constitution of any sovereign country in the world. The nation is governed on the basis of this Constitution. Dr. Bhimrao Ramji Ambedkar is regarded as the chief architect of the Indian Constitution, but it was the Constituent Assembly that worked under Dr Ambedkar and his team that drafted the final copy of the Indian Constitution.