Furthermore, Hinze (2002) carried out the additional research project entitled "Making Zero Injuries a Reality" on 38 construction projects to confirm the study of Liska et al. (1993) and revealed that there were four additional safety management techniques critical for achieving zero recordable injuries. These additional four factors were demonstrated management commitment, sub-contractor management, staffing for safety, and worker participation and involvement. Duff et al. (1994) conducted a twophase study on the effectiveness of different intervention strategies. Specifically, they looked at the effects of feedback, goal setting and training on safety performance. They found that participative goal setting is the most effective program among the three in producing marked improvements in site safety.