Editing Systems engineering (section)

===Interface design===
{{Main|Interface design}}
[[Interface design]] and its specification are concerned with assuring that the pieces of a system connect and inter-operate with other parts of the system and with external systems as necessary. Interface design also includes assuring that system interfaces are able to accept new features, including mechanical, electrical, and logical interfaces, including reserved wires, plug-space, command codes, and bits in communication protocols. This is known as [[extensibility]]. [[Human-Computer Interaction]] (HCI) or Human-Machine Interface (HMI) is another aspect of interface design and is a critical aspect of modern systems engineering. Systems engineering principles are applied in the design of [[communication protocols]] for [[local area networks]] and [[wide area networks]].