After India became independent, the new government stressed the rapid growth of heavy industry. The National Coal Development Corporation was founded in 1956 (as a Government of India) undertaking. The founding of this body was major step in the development of an indigenous Indian coal sector. Especially important was the development of the vast Dhanbad coal-mining complex with such major operations as Tata Steel, BCCL, ECL and IISCO (Indian Iron And Steel Company), as well as the Indian School of Mines IIT (ISM) Dhanbad to train engineers, geologists and managers.