Abstract
The primary purpose of this study was to assess the discriminant validity of the Culture Assessment Instrument (CAI); that is to distinguish between company mean sub-culture scores and between mean scores of a target company and that of a norm group. The primary data was obtained by a sample of convenience (N = 593) from a transport organisation. The secondary data of the norm group was constituted by convenience samples (N = 4066)from various companies originating from different industries. The 56 item scores of the CAI were factor analysed on two levels followed by iterative item analyses. Although significant differences were detected between mean culture scores, only a small proportion of the variance in these scores could be attributed to culture differences. On these grounds, the CAI does not possess discriminant validity. Suggestions for improving the CAI were made.