What is the primary purpose of CSOSS diagrams illustrating sequence of actions, interlocks, and interfaces?

• A. To calculate fuel consumption
• B. To schedule crew rotations
• C. To aid comprehension and training of operators and watch teams
• D. To compile legal compliance records

Answer: (C)

These diagrams are meant to give operators and watch teams a clear, shared understanding of how the system should operate. By showing the sequence of actions, the interlocks that prevent unsafe or incorrect steps, and the interfaces between subsystems, they provide a concrete mental model of procedures. This visual guidance makes training faster and more effective, helps personnel rehearse steps under pressure, and supports quick decision-making and safe operation by making dependencies and safety constraints obvious. They’re not about calculating fuel use, scheduling crew rotations, or producing legal compliance records, which fall outside the operational sequencing and interlock/interface visualization focus.