The doctrine of separation of powers is the cornerstone of a functional democracy. It is a doctrine of constitutional law under which the three arms of government are kept separate. The intent is to prevent the concentration of power in one arm and provide for checks and balances. If observed to the latter, the doctrine seeks to secure the independence of the Executive, the Judiciary and the Legislature.
Whereas decisional independence is absolute and no arm is to be influenced by the other when making decisions relating to the discharge of their functions, institutional interdependence is a necessary ingredient if the three arms of government are to work in harmony.