<Li> Physical Environment: Refers to factors that include both the operational setting (e.g., weather, altitude, terrain) and the ambient environment (e.g., heat, vibration, lighting, toxins). </Li> <Li> Technological Environment: Refers to factors that include a variety of design and automation issues including the design of equipment and controls, display / interface characteristics, checklist layouts, task factors and automation . </Li> <P> Condition of Operators </P> <Ul> <Li> Adverse Mental State: Refers to factors that include those mental conditions that affect performance (e.g., stress, mental fatigue, motivation). </Li> <Li> Adverse Physiological State: Refers to factors that include those medical or physiological conditions that affect performance (e.g. medical illness, physical fatigue, hypoxia). </Li> <Li> Physical / Mental Limitation: Refers to when an operator lacks the physical or mental capabilities to cope with a situation, and this affects performance (e.g. visual limitations, insufficient reaction time). </Li> </Ul>

Where do the categories in hfacs come from