The decision process is considered as the key element for the smooth behavior of systems. For non-complex or linear systems, this process usually follows clear rules or requirements, so that the decision will be easy to make without any difficulty. In the case of complex (non-linear) systems, the decision-making process is repeatedly challenged problems because of the interactions of several factors at the same time and because of the hazards characterizing these factors. This situation will worsen further if the system goes out of its normal operating range to fall into uncertainty. In this paper, we will try to make our contribution, to arrive at simplifying the decision-making process, while playing on human factors (ability, anticipation, risk-taking, etc.). As this process can be improved by the development of intelligent decision support tools.

Malaysian construction industry is considered as substantial power for the economy of the country. The value of construction work is increasing year per year. Malaysia's economy experienced a commendable growth the recent years; basically, the construction industry is statistically significant with economic development and has strong linkages with other industry sectors. However, the Malaysian construction industry is facing many challenges especially the fatal accidents. These last came first on top of the construction sector compared all other industries. This article describes the importance of the construction sector for Malaysia's economy and its efficient contribution across all states of Malaysia. Furthermore, detailed statistics and analysis were carried out to describe the severity of fatal accidents occurred in construction industry of Malaysia. Besides, recommendations were listed in order to better manage the construction industry without involving in fatal accidents. By taking into account the significant influence of the construction industry on Malaysian economy, full attention should be given to the construction field by the Malaysian government and improve further the construction management in general and the construction safety in particular.

Faced with different representation models of a work situation whose centers of interest vary from one model to another, guides have been developed to try and analyze occupational risks in their entirety. However, the development of these guides poses a double problem: the completeness of this analysis and the order attributed to the analyzed occupational risks. This article aims to solve this problem through a systemic approach that allows to develop a hierarchical model of occupational risks invariants. Its exploitation allows to carry out an exhaustive analysis of occupational risks and consequently the elaboration of a long-term strategy of prevention.