Accidents happen because of the reduction in adaptable capabilities or because inadaptability takes over. Inadaptability is the failure to adapt according to changed circumstances, settings or time. The occurrence of human errors in manual assembly lines can be affected by factors, such as workplace condition, work environment, equipment and demographics factors. Another topic explored in this book is forensic science which is concerned with the application of scientific knowledge to legal problem resolution. It is a vital tool in any legal proceeding, because it helps the judge and the jury to understand scientific truth. Also, human error in medicine is a major threat to patient safety. Therefore, it is vital to reveal factors that cause performance deficits in medical work environments. On the basis of the human error sources identified, human factors training programs can be designed as one possible approach to preventing accidents and increasing safety. Human error has been cited as a common cause in disasters and accidents in diverse high-risk industries and in healthcare. This book focuses on organizational, social and individual causes for the development of conditions behind human errors.