ICOM

ICOM stands for Input, Control, Output, Mechanism. They are the four types of arrows in an IDEF0 Diagram. In more detail, they are:

Inputs, which are the 'raw material' that gets transformed during the activity, e.g. a wire coil, outline plans.
Controls, which influence or direct how the process works, e.g. safety standards, customer requirements, project plans.
Mechanisms, which cause the process to operate, e.g. people, tools, machines.
Outputs, which are the result of the activity and are transmitted to other processes, e.g. cut lengths of wire, final plans.

See also: