HFACS MODEL CONSTRUCTION Sample Clauses

HFACS MODEL CONSTRUCTION. Originally, the HFACS is addressed in four hierarchical levels which a higher level will affect the lower level. The four levels are separately Unsafe Acts in Level 1, Preconditions for Unsafe Acts in Level 2, Unsafe Supervision in Level 3 and Organizational Influences in Level 4. In the unsafe acts level, it can be classified into two categories: Errors and Violations. Errors can be subdivided into Decision-making errors; Skill based errors and Perceptual errors. Majority accident investigations were focused on this level. This is the level of personnel behaviors which were directly involved in the lifeboat operation. In order to understand the underlying factors that cause the unsafe acts, the preconditions of unsafe acts level is needed. It can be divided into three categories which are environmental factors, condition of individuals and personnel factors. Environmental factors include physical and technical environment factors. Conditions of individuals include physical/mental limitations, adverse mental states and adverse physiological states. Personnel factors include crew recourse management and personnel readiness. The causal factors can be traced back to the upper level- unsafe supervision which is consisted of inadequate supervision, inadequate operation, failed to correct a known problem and supervisory violations. The organizational influences consisting recourse management, organizational climate and organizational process show the latent failures and influence the lower level as described above. The overall diagram is shown in figure