This figure illustrates typical human-controlled system components. The figure demonstrates two issues:

• The operator is in the control loop, preventing the operator focus on other tasks
• It is subject to failure of three sources.

The reliability of manual control

Manual control relies on the reliability of three components:

• The control (On-Off switch) used to activate the unit
• The indicator used to inform the operator of the unit situation
• The operator's capability and state of mind.

Updated on 21 Jul 2016.