The control matrix describes a method for deciding who controls the system and how, in various situations.

The first column is the operator's situation. It has three levels: inactive, regularly active and in need of control.

The columns 2-4 are three operation modes: normal operation, facing alarm and under threat.

The control options are:

• by the operator
• by the machine
• shared
• machine alerting
• extended PE

Updated on 27 Mar 2017.