Additionally, Bangalore had a Documentation Research and Training Centre (DRTC). In the early 1970s, the Delhi and Bangalore units were converted to teaching centres. In 2008, ISI Chennai was upgraded to a teaching centre. In 2011, ISI added a new centre in Tezpur. Institutes The major objectives of the ISI are to facilitate research and training of Statistics, to indulge in development of statistical theory and in application of statistical techniquesin the scenarios of planning at national level and in theoretical development of natural and social sciences, to participate in the process of data collection and analysis, to operate related projects in planning and improvement of efficiency of management and production. The Sanskrit phrase भिन्नेष्वैक्यस्य दर्शणम् (Bhinneswaykyasya Darshanam), which literally means the philosophy of unity in diversity, is incorporated in the logo of the institute, and is the motto of ISI. ISI Kolkata is the headquarter with centres at New Delhi, Bengaluru, Chennai . Tezpur, the 4th centre of ISI was inaugurated in 2011. ISI, Kolkata ISI Kolkata has a campus consisting of six addresses at 201 through 206 Barrackpore Trunk Road, Bonhooghly (Baranagar). These include a house, which was an erstwhile office of the National Sample Survey Organisation (NSSO) of India. ISI Kolkata campus is eco-friendly, as conceived by Mahalanobis. Hollow bricks that protect from heat and noise were used with minimum use of reinforced concrete, to avoid radiation. There was no use of bitumen-basalt combination at the roads inside ISI campuses. This helps in reduction of radiation and preservation of rain water to maintain equilibrium in ground-water level. The Kolkata campus offers bachelors level degree course in Statistics (B. Stat), master's degree course in Statistics (M.Stat), Mathematics (M.Math), Computer Science (MTech), Cryptology & Security (MTech), Quality Reliability and Operations Research (MTech) and Quantitative Economics (M.S.). Major divisions and units are: Statistics and Mathematics Unit (SMU), Human Genetics Unit (HGU), Physics and Applied Mathematics Unit (PAMU), Geological Studies Unit (GSU), Advanced Computation and MicroElectronics Unit (ACMU), Computer Vision and Pattern Recognition Unit (CVPRU), Machine Intelligence Unit (MIU), Electronics and Communication Sciences Unit (ECSU), Applied Statistics Unit (ASU), Economic Research Unit (ERU), Linguistic Research Unit (LRU), Sociology Research Unit (SRU), Psychometry Research Unit (PRU) and Population Studies Unit (PSU). The Kolkata campus houses the International Statistical Education Centre (ISEC), which opened in 1950. This centre provides training in statistics to sponsored students mainly from the Middle East, South and South