It operates through a network of eleven Regional Centres and more than two thousand Accredited Institutions (AIs) (Study Centres) including 800 Accredited Vocational Institutes (AVI) in India, Nepal and Middle East.
Admission is through NIOS Accredited Institutions(AIs) once a year from July to September for Academic courses and throughout the year for vocational courses through AVI.
Learning materials provided include printed self-learning material, Audio and Video programmes. Enrichment materials and information about programmes of NIOS are provided to its learners through the Half Yearly Magazine Open Learning.
Personal Contact Programs (PCP) are conducted by the AIs and training programs in AVIs.
Public Examinations are held twice a year in April-May and October-November.
The curricular and life enrichment programs are telecasted nationwide.