The mandate of NTI, as defined by its Establishment Act, is to provide Courses of Instruction leading to the Upgrade, Professional Development and Certification of Nigerian Teachers using the DISTANT LEARNING SYSTEM (D.L.S.) OF EDUCATION DELIVERY.
D.L.S. is an Education delivery Technic adopted world-wide by Distant Learning Educational Institutions whereby professionally Designed, Step-by-Step Instructional Materials are provided to the DLS students at their various LOCATIONS (called Study-Centres). In addition, professional teachers are engaged to tutor these students during their contact sessions.
While Tests, Assignments, Project Works and the Semester Final Examaninations are conducted at the Centres, the marking of the Exams Scripts and the release of the Results are handled centrally from the Headquarters.