Abstract: The purpose of this dissertation was to determine if a primary representational system (PRS), as hypothesized by Richard Bandler and John Grinder in the Neurolinguistic Programming (NLP) model of communication, could be identified by a predicate (verbs, adjectives, and adverbs) analysis method. A second purpose was to determine the temporal stability of PRSs over time; a third purpose was to compare two subject populations on PRS occurrence and stability. There were 65 subjects: 15 female and 17 male undergraduates between the ages of 18 and 23, and 17 female and 16 male mental health counselors between the ages of 30 and 50 from community mental health centers. Each subject was asked three questions privately by an interviewer. At Time 2, six weeks later, the subjects were asked three similar questions. Responses were audiotaped and transcribed. Predicates were coded into one of six categories (visual, auditory, kinesthetic, olfactory, gustatory, and none) by two representational modality coders. The interrater reliability coefficient between the modality coders on 32 randomly chosen subject predicate lists using Cohen's Kappa was .92. A PRS was operationally defined as: (a) the representational modality most frequently used; and, (b) the representational modality that occurred at a rate 20 percent higher than the next most frequently occurring modality. Results indicates that 55 of 65 subjects and 50 of 65 subjects showed PRSs at Times 1 and 2 respectively. There was a predominance of one modality over the others as 53 subjects at Time 1 and 47 subjects at Time 2 evidenced kinesthetic PRSs. However, of the 53 subjects showing a kinesthetic PRS at Time 1 only 40 of them evidenced a kinesthetic PRS at Time 2. When Cohen's Kappa was calculated, a value of .18 was obtained; thus temporal stability of PRS was not evidenced in this study. There were no significant differences between males and females as groups or between college students and mental health workers as groups regarding PRS modality preferences.