In a plasma processing method for monitoring data, first and second measurement data are obtained; and a first and a second model are formulated based on the first and the second measurement data. A pair of jaws is housed in the accommodation of the base portion for holding a key blank for cutting thereof. Depending on the number and arrangement of the projecting members, a unique subset o sensors t engaged, providing a unique electronic ID for each operator control installed. The base portion defines a first receiving hole in the second end surface. This expansion technique produces models in which inputs and values for time may be treated as variables for producing various outputs and states.