Introduction: Evidence supports the concept that working a twelve hour work shift can facilitate poor process continuity, poor teamwork, ineffective communications and inconsistency in operating procedures. It has also been demonstrated that working twelve hour shifts can influence heart rate, and the perception of comfort and stress. A growing trend especially in recent years has been the 12-hour work shift replacing the traditional 8-hour work schedule. Several researchers have outlined the reasons why 12-hour schedules have become popular. It has been identified that one of the main reasons for implementing a 12-hour shift is to negate the disruptive effects shift work has on an employee''s health, wellbeing and lifestyle. National Institute for Occupational Health and Safety in the United States stated that the 12-hour schedules are popular with employees as it allows more time, via extra days off, to recuperate from the nightshift; it increases time spent with family and friends and allows more time for other recreational pursuits. One of the main concerns with implementing a 12-hour work schedule is the effect it has upon employee''s levels of fatigue which could then lead to health or safety hazards, as well as reduce productivity, and increase turnover and absenteeism. This study will utilize information collected from two groups; one working twelve hour shifts and one working eight hour shifts. The data presented will be obtained through interviews, questionnaires and research regarding shift work and ill health effect. This study will look at the impact that working twelve hour shifts has on workplace productivity, employee satisfaction, poor health, and job safety. The study will look at the effects of shift work on the physiology of the subjects by self-reporting and the psychological impact by evaluation from an interview process and questionnaires. It will also study the cognitive effects that promote increased productivity and decreased injuries through evaluations done by employers on the subject group as a whole. Statement of the Problem: In the general industry shift work and extended hours are becoming the normal part of day to day business. Need for the Study: This study is needed to examine more closely the advantages and disadvantages of 12-hour schedules especially with regard to health and safety, organizational effectiveness, as well as its impact on family and social life. Hypothesis: By subjecting workers to twelve hour schedules health and safety will be negatively impacted, along with organizational effectiveness, family and social life.