THE QUANTIFICATION OF HUMAN RELIABILITY. A FEASIBILITY DEMONSTRATION
Technical information series
GENERAL ELECTRIC CO PHILADELPHIA PA MISSILE AND SPACE DIV
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The purpose of this study was to demonstrate a method of calculating the probability of human errors during prelaunch testing. Completion of studies described herein will permit the following statements a The probability that the test can be completed without human error, b The probability that human errors will remain undiscovered, c The probability that undiscovered errors will result in failures. In addition to a reliability number for the total test, such studies will provide a breakdown of reliabilities for all human tasks in the test. Areas of greatest risk can then be pinpointed and corrective efforts focused on them. A proposed method for calculating system reliability is described. Development and application of this method will permit assessment of the contribution of each preflight test to over-all system reliability, and will also point out the need for adding or removing tests. This method takes into account the probabilities a that the hardware was manufactured correctly, b that the hardware will not be damaged by human handling, c that the tests administered to the hardware will reveal all malfunctions, and d the inherent reliability of the hardware. Reliability thus determined would be a function of the following R f CI where R reliability, C confidence, and I inherent reliability.