An effort has been made in this book to estimate the time for fatigue of a human operator via a quantitative study based on the workload. Workload in turn depends on the condition of the operator and environmental conditions, which is reflected in the muscle temperature. Simple yet comprehensive mathematical models for heat transfer in human body were developed for both steady as well as transient states.The models were also validated against the results available in the literature. Parametric studies involving the condition of the operator and the environment were also carried...