Chain of Command

What exactly is 'Chain of Command'?

Chain of Command is in essence, who is in charge. All Heads of Staff are considered on an equal level apart from the captain who was authority over all crew. When being given orders they should be treated using the following priority:

The Captain > Your Head of Staff > Other Heads of Staff.

The list goes as followed:

Interim Heads of Staff

In the event that a department is lacking a Head of Staff, someone with enough training can be assigned as a Interim Head of Staff by the Captain or Head of Personnel.