They are LANGUAGE ROLE, PROCESS SHARING, and MEDIUM. The role of language may be CONSTITUTIVE or ANCILLARY. The process sharing ranges from the most ACTIVE to the most PASSIVE. Process sharing is closely related to CHANNEL, which may be PHONIC or GRAPHIC. The component, i.e. Medium, is divided into SPOKEN MEDIUM and WRITTEN MEDIUM. Medium refers to how linguistic elements are organized in a discou