The model on the left is an adaptation of the original James Reasons' Swiss Cheese model. It was adapted to represent a slot machine to make it more interactive. When the holes line up, you lose not win. The holes represent hazards, some of which may lay dormant for a long time until an "active" failure and an accident reveals them. It was further adapted to represent the role of a Safety Management System by adding a "SMS Incident Drip Tray". The purpose of the tray was to gather information that would reveal the hazards without having to have an accident. System Safety Services calls this tray a "Free Lesson Tray".

For further information on this model please go to https://www.system-safety.com/Training_Aids/Misfor...

System Safety Services will be pleased to provide a kit containing: 1 Management Disk, 1 Line Management Disc, 1 Preconditions Disk, 1 Unsafe Act Disk, 1 Safety Net Disk, 1 Connecting Rod with wing nut, 4 spacers, 1 SMS Drip Tray, 1 Pointer Expandable, 1 DVD PowerPoint Disk. All of the above come in a plastic carrying case.