Also, BNs are being applied in different research related to safety and health. For instance, Zhou et al. (2008) proposed a BN model to establish a probabilistic relational network looking at causal factors, including safety climate factors and personal experience factors, which exert influences on human safety behavior. In a primary study the authors found that safety behavior was more sensitive to safety climate factors including management commitments and workmate's influences and less sensitive to personal experience factors such as work experience and education experience. The study also indicated using a simple strategy did not result in the obtainment of a higher safety behavior goal. A joint strategy of simultaneously controlling multiple factors proved more effective. Further analysis indicated that the effectiveness of a joint strategy did not necessarily coincide with the combination of the most effective simple strategies. In this particular study the combination of safety climate factors (i.e. safety management systems and procedures, employee's involvement) and personal experience factors (i.e. work experience) achieved the higher results on safety behavior. Martín et al. (2009) used BNs to analyze self-reported workplace accidents caused by falls from a height. The BNs enabled the researchers to identify the circumstances that had the greatest bearing on workplace accidents, such as the adoption of incorrect work postures, the duration of tasks, and a worker's inadequate knowledge of safety regulations. For these authors, BNs represented a statistical tool of huge potential in investigating the causes of accidents in the workplace. BNs enabled the researchers to establish the dependency relationships between the different causes of accidents.