This study investigated the interrelationship of articulation and receptive and expressive language performance by 306 children in kindergarten and first and second grade in Fort Collins, Colorado, with regard to age, sex, and socioeconomic level. Fifty-one males and 51 females from the sample group were tested on three pairs of tests: the Arizona Articulation Proficiency Scale (AAPS) and an experimental articulation test; the Northwestern Syntax Screening Test: Receptive (NSST:R) and an experimental repetitive test; and the Northwestern Syntax Screening Test: Expressive (NSST:E) and an experimental test of oral expression. Little or no correlation was shown to exist between articulation and expressive language performance as measured by the AAPS and the NSST:E or between articulation and receptive language performance as measured by the AAPS and the NSST:R. A high interrelationship between receptive and expressive language performance was apparent, according to the NSST:R and the NSST:E. Correlations were also found in some age subgroups, between standardized and experimental articulation tests and between standardized and experimental expressive language tests. (Author/KS)