The behaviorists also believe in imperfections of authority delegation and functionalism of processes. It is said that the principles of scalar chain and functional processes under classical theory of organisation have only theoretical validity and tend to deteriorate in practice. A number of human causes are responsible for it. Thus, orders and policies even when clearly stated are subject to reinterpretations by people in the organisation depending upon the psychological set of conditions, the environment and the conflicting pressures under which they operate. At the same time, leadership is also described as an important factor in organisation.