As envisaged in the NPE-1986, the DIETs have been set up in the districts of the country in phase manner. In Nagaland, the first DIET was set up at Kohima (Chiechama) in 1989 and became operational in 1993. Two more DIETs, one at Mokokchung, and the other at Tuensang was set up in May 1998 and became operational in the year 1999. The Institutes were set up by the State Government with central assistance by upgrading the erstwhile JTTIs (Junior teachers Training Institute).
The District institute of Education and Training (DIET) Tuensang was inaugurated on the 4th of may 1998 by Late Shri H.Chuba Chang, former Minister of Education, Nagaland.
DIET, Tuensang is located in the old medical ‘A’ colony in the heart of Tuensang town. Tuensang district lies in the eastern part of Nagaland about 267 km from the state capital, Kohima.