Reliability of professional engineers who understand the principles of performance evaluation and prediction to improve product / systems safety, reliability, and ease of care. S of this chapter and the appropriate manuals Body Knowledge (BOK) is defined for the ASQ's Reliability Engineer certification, which includes design review and control, prediction, estimation, and the distribution methodology, failure mode and effects analysis, planning, operation, and analysis of reliability testing and field failures, including mathematical models; understanding of human factors in reliability, and ability to develop and manage the reliability of information systems for failure, design analysis and performance improvement, and reliability management courses during the entire product life cycle.