प्रशासन में 'उचित माध्यम से' (Through proper channel) शब्द का प्रयोग किस सिद्धांत को लागू करने के लिए किया जाता है?

In administrative terminology, 'Hierarchy' refers to:

In a sound democratic administration, which two key principles must always go hand in hand?

Who stated, 'Coordination is the first principle of organization and includes within itself all other principles which are subordinate to it and through which it operates'?