The nomination of trainees for a course included in the Annual Calendar of Training Programme (COTP) finalised by the Regional Advisory Committee (RAC), is done by the user offices.

This Institute normally provides training only to the personnel working in Indian Audit & Accounts Department. However, in special cases, training for officials of State Government and Government organisations are also conducted.

There are a total of 16 user offices of RTI, Shillong. These are the offices of the Indian Audit & Accounts Department located in the states of Assam, Arunachal Pradesh, Meghalaya, Manipur, Mizoram, Nagaland, Sikkim and Tripura.

These Regional Training Institute caters to the training requirements of various offices of IA&AD located in different states of the country. Every RTI has its own set of user offices to which they provide training and assistance in capacity development areas. Non IAAS Group A, Group B and Group C officials of IA&AD are trained at these RTIs/RTCs. Occassionally, IAAS Officers are also trained at RTIs/RTCs.

RTI is an abbrivation for Regional Training Institutes of the Indian Audit & Accounts Department. There are in total ten such RTIs in this Department. RTIs cater to the training, research and development work of IA&AD. Apart from the ten RTIs, there are also two Regional Training Centres (RTCs) located at Delhi and Bengaluru.