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identification of sources of human reliability
reliability engineers are concerned with gross changes in probability of failure whithin systems e.g factors of 10,the proverbial "order of magnitude". the portion of HEART which is likely to be of most interest to reliability engineers is concerned with those factors,therefore,which are likely to produce probability of failure modification in exess of a factor of 3,and which could possibly threaten system safety or reliability. in addition to identifying the strengths of these factors a great many others will be mentioned.which whilst failing to satisfy the factor of 3 criterion are important to the assessor,precisely for this latter reason. quitea number of these latter performance-shaping factors are frequently mentioned in the literature in the context of large changes,but as will be seen from the assessor`s point-of-view their effects are relatively small and may be ignored for most practical reliability assessment purpose