To err is human. In everyday life, human error is around every corner. Human error is defined as “an error made by a person rather than being caused by a poorly designed process or the malfunction of a machine such as a computer.” (Encarta, 2009) To simplify this definition, people make mistakes. Human error can manifest itself in the form of human behavior or conduct that can be classified as undesirable, unacceptable, negligent, careless, forgetful, reckless, malicious, a miscommunication, human performance that is extreme in variability or beyond the limits of what expected, or an inappropriate form of risk-taking behavior. An error may be harmless, detectable, and correctable, or it may serve to predict future problems (Peters, 2006). Many references to human error are associated with high-profile disasters. Public concern over these high-profile disasters puts human error under the spotlight. Some examples of disasters due to human error include: the Tenerife runway collision in 1977, Three Mile Island in 1979, the Bhopal methyl isocyanate tragedy in 1984, the 1986 Challenger and Chernobyl disasters, and the of the Piper Alpha oil rig in 1988. While these catastrophes If human error concerns are put in the spotlight, the impact of human error on manufacturing operations can be equally damaging. All the disasters described above occurred during a period of night shift work. Shift work involves alternating teams of workers who each work on a specific “shift” and who usually perform the same work tasks so that operations can be continued for a longer period than allowed by the individual worker. Shift work schedules necessarily require some workers to work for periods of time… half paper questionnaires for the convenience sample formed the basis of the study. This data was collected over a three-week period. The questionnaires were evaluated and descriptive statistics via means and standard deviations were used to describe the effect on job performance. This study shows that all age groups are subject to exposure to physiological and psychological risks arising from the night shift, as indicated in their subjective response. It also shows that shift work is related to workplace fatigue and workplace injury rates (Hayajneh, 2008). From the literature review it appears that most research and studies support the fact that injury rates and shift work are related. The studies examined as part of this literature review compare and contrast various aspects of business functions with similar findings in injury rates and shift work data.