Human error plays a significant role in many accidents involving safety-critical systems (e.g., air-traffic control systems, railway safety systems, and nuclear plant protection systems). Because of this, it is now a standard requirement in both the US and Europe for Human Factors (which looks at how people use systems, where the causes of human error lie etc) to be taken into account when designing systems of this type. Written by an experienced consultant, this book will be an essential guide for anyone who uses HF in their everyday work, providing them with consistent and ready-to-use procedures and methods that can be applied to real-life problems. It includes four real-life case studies which show the reader how the above framework and guidelines work in practice.