This study was designed based on the findings of Campbell et al. (1993) that the determinants of performance (knowledge and motivation) mediate the relationship between antecedents and components of performance. The first purpose of this study was to establish the unidimensionality and reliability of the six safety management practices scales, safety knowledge, safety motivation, safety compliance and safety participation. The second purpose of this study was to investigate the direct and mediating effects of safety knowledge and motivation on the relationship between the six safety management practices and safety behaviour (safety compliance and safety participation). The hypothesized model of the study is depicted in Fig. 1.