DIET can emerge as a hub of educational value through a vibrant resource centre and a centre for teacher learning at the district level. It could bring to use the local knowledge, build on its competencies and integrate the use of educational technologies to facilitate processes of maintaining and disseminating knowledge and skills.
DIETs have been given the responsibility to develop facilities for teachers to experiment assimilae of educational technology and practise modern techniques of evaluations. Apart from this, DIETs have been assigned the responsibility to display training materials created by teachers, its exhibition, publication and expansion for the benefit of all. To ensure uniformity in functioning of DIETs, the Pink Book published in November, 1989 by HRD ministry has been accepted as the Guide Book. On the basis of this Pink book, training programmes for in-service as well as pre-service teachers are planned throughout India.