The aim of this study was to establish the construct validity of an instrument for assessing organisational socialisation. A purposive sample of 170 respondents completed the socialisation instrument. Scale reliabilities and a confirmatory factor analysis confirmed six constructs (History, Language, Politics, People, Organisational Goals and Values, and Performance Proficiency) as measures of this domain. The significance of the findings of this study is that from a South African perspective, the socialisation instrument can be useful in measuring organisational socialisation. This instrument can also be valuable in assessing the effectiveness of the socialisation tactics used by organisations.