The next layer is the dedicated safety shutdown system, which shuts down the process unit completely if the process control system fails to manage the incident. All of the major vendors of large process control systems—including ABB, Emerson Process Management, Honeywell, Invensys, Siemens and Yokogawa—include safety solutions as part of their systems. The final layer of safety is the fire and gas protection system, which prevents and contains catastrophic incidents. Explains Ghosh, "If the CCM, or Critical Condition Management system, does not work, for whatever reason, there are safety shutdown procedures that keep the plant safe, but can cost millions of dollars in lost production. The ideal CCM should prevent a system shutdown by giving the operators guidance through alarm filters and deductive alarm notification, and supporting the operators in the recovery process."