Explanation:

• The Cabinet Secretariat functions directly under the Prime Minister. The administrative head of the Secretariat is the Cabinet Secretary who is also the ex-officio Chairman of the Civil Services Board.
• The business allotted to Cabinet Secretariat is (i) Secretarial assistance to Cabinet and Cabinet Committees; and (ii) Rules of Business.
• The Cabinet Secretariat is responsible for the administration of the Government of India (Transaction of Business) Rules, 1961 and the Government of India (Allocation of Business) Rules, 1961, facilitating smooth transaction of business in ministries/departments of the Government by ensuring adherence to these rules. It assists in decision-making by ensuring inter-ministerial coordination, ironing out differences amongst Ministries/Departments and evolving consensus through the instrumentality of the standing and ad hoc Committees of Secretaries.
• The Cabinet Secretariat ensures that the President, the Vice-President and Ministers are kept informed of the major activities of all ministries/departments by means of monthly summary of their activities. Management and coordinating activities of various ministries in such a situation is also one of the functions of the Cabinet Secretariat.
• The Cabinet Secretariat is a useful mechanism by the departments for promoting inter-ministerial coordination since the Cabinet Secretary is also the head of the Civil Services. The Secretaries keep the Cabinet Secretary informed of developments from time to time. The Transaction of Business Rules also require them to keep the Cabinet Secretary informed specially if there are any departures from these rules.