A human factors engineering expert performs analysis of human performance errors, or alleged performance errors, that lead to personal injury or death; and reconstruction of biomechanical or cognitive human behaviors involved in an incident to assess injury causation due to human performance or alternatively equipment or facility design and operation. Examples include Warnings and Instructions issues; Vehicle or Equipment Operation; Slip, Trip, Stumble and Fall; Machine Guarding; Hazardous Product Design; and Falls from Heights.