|This article does not cite any references or sources. (December 2009)|
|Outline of War|
A command hierarchy is a group of people dedicated to carrying out orders "from the top", that is, of authority. It is part of a power structure: usually seen as the most vulnerable and also the most powerful part of it.
In sociology it is seen as the most visible element of a power network, which itself usually organizes many social networks. The entire network has social capital which is mobilized in response to the orders that move through the hierarchy - and closely controlled. This leads to the phrase command and control.
Chain of command 
|Chain of command|
|army group||400,000–1,000,000||field marshal|
|army region||1,000,000–3,000,000||field marshal|
In a military context, the chain of command is the line of authority and responsibility along which orders are passed within a military unit and between different units. Orders are transmitted down the chain of command, from a higher-ranked soldier, such as a commissioned officer, to lower-ranked personnel who either execute the order personally or transmit it down the chain as appropriate, until it is received by those expected to execute it.
In general, military personnel give orders only to those directly below them in the chain of command and receive orders only from those directly above them. A service member who has difficulty executing a duty or order and appeals for relief directly to an officer above his immediate commander in the chain of command is likely to be disciplined for not observing the chain of command. Similarly, an officer is usually expected to give orders only to his or her direct subordinate, even if it is just to pass an order down to another service member lower in the chain of command than said subordinate.
The concept of chain of command also implies that higher rank alone does not entitle a higher-ranking service member to give commands to anyone of lower rank. For example, an officer of unit "A" does not directly command lower-ranking members of unit "B", and is generally expected to approach an officer of unit "B" if he requires action by members of that unit. The chain of command means that individual members take orders from only one superior and only give orders to a defined group of people immediately below them.
If an officer of unit "A" does give orders directly to a lower-ranked member of unit "B", it would be considered highly unusual (a faux pas, or extraordinary circumstances, such as a lack of time or inability to confer with the officer in command of unit "B") as officer "A" would be seen as subverting the authority of the officer of unit "B". Depending on the situation or the standard procedure of the military organization, the lower-ranked member being ordered may choose to carry out the order anyway, or advise that it has to be cleared with his or her own chain of command first, which in this example would be with officer "B". Refusal to carry out an order is almost always considered insubordination, the only exception usually allowed is if the order itself is illegal (i.e., the person carrying out the order would be committing an illegal act). (See Superior Orders.)
In addition, within combat units, line officers are in the chain of command, but officers in specialist fields (such as medical, dental, legal, supply, and chaplain) are not, except within their own specialty. For example, a medical officer in an infantry battalion would be responsible for the combat medics in that unit but would not be eligible to command the battalion or any of its subordinate units.
In the military the term CCC (or "C3") is sometimes used to include "communications" as the "third C": Command, Control and Communications . Since military situations involve disrupted, hurried, confused or deliberately intercepted and altered communications - see signals warfare and information warfare, and also a degree of manipulation of emotion - see psychological warfare - it is important that communications be closely monitored to ensure that command actually results in control. Possibly the most extensive studies of this were in the Cold War when both the USA and USSR put great effort into ensuring that their strategic missile forces were under full control and that communications to them could not be interfered with, disrupted, or manipulated in any way.
Regardless of the degree of control or results achieved, and regardless of how the hierarchy is justified and rationalized, certain aspects of a command hierarchy tend to be similar:
- rank - especially military rank - "who outranks whom" in the power structure
- strict accountability - those who issue orders are responsible for the consequences, not those who carry them out
- strict feedback rules - complaints go up the hierarchy to those with power to deal with them, not down to those who do not have that power
- detailed rules for decision making - what criteria apply and when
- standardized language and terminology
- some ethics and key beliefs in common, usually enforced as early as recruiting and screening of recruits
However, people of such compatible views often have similar systemic biases because they are from the same culture. Such problems as groupthink or willingness to accept one standard of evidence internal to the group, but require drastically higher evidence from outside, are common.
In part to address these problems, much modern management science has focused on reducing reliance on command hierarchy especially for information flow, since the cost of communications is now low, and the cost of management mistakes is higher - especially under globalization - than at any point in the past. It is also easier to replace managers, so they have a personal interest in more distributed responsibility and perhaps more consensus decision making.
Ubiquitous command and control posits for military organizations, a generalisation from hierarchies to networks which allows for the use of hierarchies when they are appropriate, and non-hierarchical networks when they are inappropriate. This includes the notion of mission agreement, to support "edge in" as well as "top-down" flow of intent.
See also 
- Command (military formation)
- Hierarchical organization
- Incident Command System
- Military command
- Command and control
- Military rank
- Directive control