Table 1.

Description of levels within the Viking Speech Scale (VSS), Communication Function Classification System (CFCS), and the speech language profile groups (SLPG).

Classification System	Description of Levels
CFCS	Level I – Effective sender/receiver with both unfamiliar/familiar partners Level II – Effective sender/receiver with both unfamiliar/familiar partners but the pace of conversation is slower Level III – Effective sender/ receiver with familiar partners only; not effective with unfamiliar partners Level IV – Inconsistent sender and/or receiver with familiar partners; not effective with unfamiliar partners Level V – Seldom effective sender/receiver with familiar partners; not effective with unfamiliar partners
VSS	Level I – No speech motor disorder Level II – Speech motor disorder but usually understandable to unfamiliar listeners Level III – Speech motor disorder but not usually understandable to unfamiliar listeners out of context Level IV – No understandable speech
SLPG	NSMI – No speech motor involvement SMI-LCT – Speech-motor involvement and age-appropriate language and/or cognitive skills SMI-LCI – Speech-motor involvement and impaired language and/or cognitive skills ANAR – Unable to produce speech