Premises "safety" experts testify during litigation after evaluating a property or piece of equipment to determine if a personal injury resulted from a defective structure design, architecture, a poorly maintained public area, a malfunctioning machine, lack of equipment maintenance, or from the carelessness of the injured person. Safety experts conduct tests on the equipment, the structure or the public walkway to determine its safety. Premises "security" experts testify during litigation after conducting a security survey of a property or a review of procedures to determine if a personal injury suffered from violent criminal acts occurred, in part, because of inadequate security such as defects in locks, doors, gates, lighting, visibility, alarms or from the lack of guard service, or from defective policies and procedures. Security experts perform crime foreseeability assessments and adequacy of security analysis.